子分类：
| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 141 | Optical switches | US273616 | 1994-07-12 | US5445767A | 1995-08-29 | Christoper S. Winter; Stephen N. Oliver; James D. Rush; Allan E. Underhill; Callum A. S. Hill |
| ##STR1## The specification identifies dithiolenes which give good performance as the critical region of an optical switch. The dithiolenes have the formula shown in FIG. 1 wherein: (A) the R groups, any two of which may be the same or different, are selected so as to tune the absorption bands of the molecule for use at the operational wavelength and/or to act as bridges to join molecules together: (B) the X groups, any two of which may be the same or different, are selected from S and Se: (C) M is selected from Ni, Pt, Pd and Cu: (D) C=-1 or 0: and (E) (i) when C=-1, Y is a cation to render the molecule electrically neutral: preferably Y is selected from ammonium, substituted ammonium, Na +, Li + and K +, (ii) when C=0, Y is absent (since the molecule is neutral there is no change to balance). The dithiolene may be diluted with an organic polymer selected from polyacrylates, polymethacrylates, such as polymethymethacrylate, polycarbonates, polyisobutylene, polyethylene terephthalate, polystyrene and polysiloxane. | ||||||
| 142 | Polymer precursor for silicon carbide/aluminum nitride ceramics | US226133 | 1994-04-11 | US5437825A | 1995-08-01 | James A. Jensen |
| A block copolymer is prepared by reacting an aluminumnitrogen polymer and a silazane polymer at a temperature not greater than 400.degree. C. Block copolymers containing alkenyl or alkynyl groups can be crosslinked by supplying energy to generate free radicals, An AlN/SiC-containing ceramic is formed by pyrolyzing the crosslinked block copolymer in a nonoxidizing atmosphere. | ||||||
| 143 | Polymetalosilazane, process of producing same, silicon nitride based ceramic, and process of preparing same | US223866 | 1994-04-06 | US5436398A | 1995-07-25 | Yasuo Shimizu; Hirohiko Nakahara; Tomoko Aoki; Osamu Funayama; Takeshi Isoda |
| A preceramic polymetalosilazane substantially free of Si-O groups is produced by reacting a polysilazane with a metal alkoxide in the presence of an alkylsilazane or alkylsilane. The preceramic polymer gives a high strength and heat resistant ceramic body which remains amorphous when calcined at 1,600.degree. C. for 10 hours in the atmosphere of nitrogen. | ||||||
| 144 | Neutral and mixed neutral/anionic polymetallooxanes | US34531 | 1993-03-19 | US5418298A | 1995-05-23 | Richard M. Laine; Brian L. Mueller; Tom Hinklin |
| This invention relates to polymetallooxanes having the moiety: ##STR1## wherein n is 1.5, 2, 3, 4, 5 or 6, M.sup.1 is selected from the group consisting of Si, Ge, Sn, Al, Ga, Ti, Zr, or Hf, R.sup.1 and R.sup.2 are selected from the group consisting of H, OH, C.sub.1-8 alkyl, C.sub.1-6 alkoxy, C.sub.2-8 alkene, C.sub.6-12 aryl, C.sub.1-8 hydroxyalkyl, C.sub.1-8 thioalkyl, C.sub.2-12 alkoxyalkyl, C.sub.4-20 heteroaromatic, C.sub.1-10 alkylsilane, C.sub.1-10 alkylsiloxane or combinations thereof, O' is bonded to M.sup.1, another M.sup.1 atom, M.sup.2 or H, wherein M.sup.2 is a group I or II metal of the Periodic Table, and R.sup.3 is independently selected from the group consisting of (CR.sub.2).sub.y, O'--(CR.sub.2 CR.sub.2).sub.y N(CR.sub.2).sub.y --, --(CR.sub.2 CR.sub.2).sub.y N.sub.R (CR.sub.2).sub.y --, O'--[(CR.sub.2 CR.sub.2).sub.y O].sub.y --(CR.sub.2).sub.y, C.sub.1-8 alkyl, C.sub.1-6 alkoxy, C.sub.2-8 alkene, C.sub.6-12 aryl, C.sub.1-8 hydroxyalkyl, C.sub.1-8 thioalkyl, C.sub.2-12 alkoxyalkyl, C.sub.4-20 heteroaromatic, C.sub.1-10 alkylsilane, C.sub.1-10 alkylsiloxane or combinations thereof wherein R is selected from the group consisting of H, OH, C.sub.1-8 alkyl, C.sub.1-6 alkoxy, C.sub.2-8 alkene, C.sub.6-12 aryl, C.sub.1-8 hydroxyalkyl, C.sub.1-8 thioalkyl, C.sub.2-12 alkoxyalkyl, C.sub.4-20 heteroaromatic, C.sub.1-10 alkylsilane, C.sub.1-10 alkylsiloxane or combinations thereof, and wherein y is a number 1 to 10. Also described is a method of producing the claimed polymetallooxanes. | ||||||
| 145 | Phosphorous polymers | US086515 | 1993-07-01 | US5403519A | 1995-04-04 | Hermann L. Rittler |
| There is disclosed an amorphous, polymeric material that contains phosphorous, aluminum and carbon atoms, and that is the reaction product of a buffered liquid mixture of a source of phosphorous, such as 85% phosphoric acid, a source of aluminum, such as boehmite, and an organic liquid buffer, such as a carboxylic acid. The polymeric material may be converted to a glassy or crystalline solid by heating to a temperature of at least 150.degree. C., and may be cellulated. | ||||||
| 146 | Energy polymerizable compositions containing organometallic initiators | US9845 | 1993-01-27 | US5385954A | 1995-01-31 | Michael C. Palazzotto; William A. Hendrickson |
| An energy polymerizable composition and process therefore, comprising a cationically polymerizable material and a catalytically effective amount of an ionic salt of an organometallic complex cation as polymerization initiator, said ionic salt of an organometallic complex cation being capable of adding an intermediate strength nucleophile or upon photolysis capable of liberating at least one coordination site, said metal in said organometallic complex cation being selected from elements of Periodic Groups IVB, VB, VIB, VIIB, and VIIIB are disclosed. Certain of the organometallic metallic polymerization initiators are novel cationic salts. | ||||||
| 147 | Method for preparing a polysiloxane and titanate composition for high refractive index coatings | US92922 | 1993-07-19 | US5357024A | 1994-10-18 | Yves Leclaire |
| A method of preparation of a polysiloxane resin composition for an antiabrasion coating having a high refractive index involves hydrolysis of a first constituent of the organosiloxane type to an alkoxysilane hydrolyzate containing condensable silanol groups, and reaction of the hydrolyzate obtained with a second constituent formed of an organic compound of titanium having at least one titanium ester function of carboxylic acid, with addition of a quantity of water such as to cause hydrolysis of the hydrolyzable groups which remain in the mixture obtained and formation of a siloxane prepolymer which integrates the titanium. | ||||||
| 148 | Hydridosiloxanes as precursors to ceramic products | US908214 | 1992-07-02 | US5319121A | 1994-06-07 | Yigal Blum |
| A method is provided for preparing preceramic polymers and and silicious ceramic materials which derive therefrom. The preceramic polymers are polysiloxanes which are synthesized by catalytically activating Si--H bonds in a hydridosiloxane starting material and replacing the activated hydrogen atoms with non-hydrogen substituents. These preceramic polysiloxanes are pyrolyzed in a selected atmosphere to give the desired ceramic product. Ceramic products which may be prepared by this technique include silica, silicon oxynitride, silicon carbide, and metal silicates. | ||||||
| 149 | Thermosetting copolymers, silicon carbide-based fiber and processes for producing same | US900843 | 1992-06-18 | US5292830A | 1994-03-08 | Osamu Funayama; Tomohiro Kato; Rika Takatsu; Yuuji Tashiro; Toshihide Kishi; Takayuki Date; Takeshi Isoda |
| A thermoplastic silicon-containing polymer, which may be a precursor of SiC, and which can be transformed to a thermosetting polymer by copolymerizing it with a thermosetting perhydropolysilazane or polyborosilazane. | ||||||
| 150 | Organic-inorganic polymeric composites | US725168 | 1991-07-03 | US5252654A | 1993-10-12 | Israel A. David; Mark A. Harmer; Jeffrey S. Meth; George W. Scherer |
| A polymeric composite of an organic polymer and an inorganic glassy polymer and a process for making such composites which are useful as protective coatings and as nonlinear optical elements. | ||||||
| 151 | Thionyl phosphazene polymers | US848940 | 1992-03-10 | US5241017A | 1993-08-31 | Ian Manners; Mong Liang; Andreas Ostrowicki |
| The new thionyl phosphazene polymers, which contain recurring structural units corresponding to the following formula ##STR1## are prepared by ring-opening polymerization of cyclothionyl chlorophosphazene corresponding to the following formula ##STR2## at temperatures of 100.degree. to 300.degree. C. in the presence of an inert organic solvent and reaction of the polymer thus obtained, which corresponds to the following formula ##STR3## with salts corresponding to the following formulaM(R.sup.1 -R.sup.5)in the presence of an inert organic solvent at temperatures of 20.degree. to 200.degree. C.The new thionyl phosphazene polymers may be used for the production of thermoplastics, elastomers or thermosets. | ||||||
| 152 | Energy polymerizable compositions containing organometallic initiators | US799046 | 1991-11-26 | US5191101A | 1993-03-02 | Michael C. Palazzotto; William A. Hendrickson |
| An energy polymerizable composition and process therefore, comprising a cationically polymerizable material and a catalytically effective amount of an ionic salt of an organometallic complex cation as polymerization initiator, said ionic salt of an organometallic complex cation being capable of adding an intermediate strengeth nucleophile or upon photolysis capable of liberating at least one coordination site, said metal in said organometallic complex cation being selected from elements of Periodic Groups IVB, VB, VIB, VIIB, and VIIIB are disclosed. Certain of the organometallic metallic polymerization initiators are novel cationic salts. | ||||||
| 153 | Hybrid sol-gel optical materials | US479136 | 1990-02-13 | US5130397A | 1992-07-14 | John M. Zeigler |
| Hybrid sol-gel materials comprise silicate sols cross-linked with linear polysilane, polygermane, or poly(silane-germane). The sol-gel materials are useful as optical identifiers in tagging and verification applications and, in a different aspect, as stable, visible light transparent non-linear optical materials. Methyl or phenyl silicones, polyaryl sulfides, polyaryl ethers, and rubbery polysilanes may be used in addition to the linear polysilane. The linear polymers cross-link with the sol to form a matrix having high optical transparency, resistance to thermooxidative aging, adherence to a variety of substrates, brittleness, and a resistance to cracking during thermal cycling. | ||||||
| 154 | Hydridosiloxanes as precursors to ceramic products | US341722 | 1989-04-21 | US5128494A | 1992-07-07 | Yigal Blum |
| A method is provided for preparing preceramic polymers and silicious ceramic materials which derive therefrom. The preceramic polymers are polysiloxanes which are synthesized by catalytically activating Si-H bonds in a hydridosiloxane starting material and replacing the activated hydrogen atoms with non-hydrogen substituents. These preceramic polysiloxanes are pyrolyzed in a selected atmosphere to give the desired ceramic product. Ceramic products which may be prepared by this technique include silica, silicon oxynitride, silicon carbide, and metal silicates. | ||||||
| 155 | Tetraketone porphyrin monomers and the porphyrin-based polymers thereof | US491747 | 1990-03-12 | US5091502A | 1992-02-25 | Subhash C. Narang; Susanna Ventura; Tilak R. Bhardwaj |
| The present invention relates to a tetraketone of the structure ##STR1##wherein M is a metal atom and R is selected from phenyl, alkyl substituted phenyl or halogen substituted phenyl. The process to prepare this tetraketone is disclosed. The present invention also relates to a process to produce the tetraketone structure(I). The present invention also relates to the novel polymer of the structure: ##STR2##and to the process to produce this novel polymer. R is as defined hereinabove, and Ar is a tetraamine substituted organic moiety having at least one aromatic ring. These polymers are useful as liquid crystals and in non-linear optical devices. | ||||||
| 156 | Energy polmerizable compositions containing organometallic initiators | US443660 | 1982-11-22 | US5089536A | 1992-02-18 | Michael C. Palazzotto |
| An energy polymerizable composition and process therefore, comprising a cationically polymerizable material and a catalytically effective amount of an ionic salt of an organometallic complex cation as polymerization initiator, said ionic salt of an organometallic complex cation being capable of adding an intermediate strength nucleophile or upon photolysis capable of liberating at least one coordination site, said metal in said organometallic complex cation being selected from elements of Periodic Groups IVB, VB, VIB, VIIB, and VIIIB are disclosed. Certain of the organometallic metallic polymerization initiators are novel cationic salts. | ||||||
| 157 | Polysilazanes and related compositions, processes and uses | US503824 | 1990-04-03 | US5055431A | 1991-10-08 | Yigal D. Blum; Edward J. Crawford |
| Silazanes and related compounds are prepared by providing a precursor containing one or more cyclic silazane units, causing polymerization to occur in the presence of a transition metal catalyst to form a polysilazane product. Further products may result from additional reaction. The novel compounds may be pyrolyzed to yield ceramic materials such as silicon nitride, silicon carbide and mixtures thereof. In a preferred embodiment, substantially pure silicon nitride and articles prepared therefrom are provided. Fibers, coatings, binders and the like may be prepared from the novel materials. | ||||||
| 158 | Heat-resistant and corrosion-resistant composition | US397497 | 1989-08-16 | US5051207A | 1991-09-24 | Toshikatsu Ishikawa; Katsuya Tokutomi; Hiroshi Ichikawa; Shiro Mitsuno; Hideto Nagai |
| A heat-resistant, corrosion-resistant composition comprising a metal alcoholate, a curing agent, a filler and an organic solvent. | ||||||
| 159 | Process for making ceramic materials | US449495 | 1989-12-01 | US5017529A | 1991-05-21 | Yigal D. Blum; Richard M. Laine |
| A process for preparing tractable preceramic precursors of Group IIIA metal/Group VA nonmetal compounds, such as BN, in which a first reactant containing a Group VA nonmetal to hydrogen bond, such as ammonia or an amine is reacted with a second reactant containing a Group IIIA metal to hydrogen bond, such as a metal hydride, in the presence of a metal catalyst that catalyzes dehydrocoupling of the bonds to form the precursor. Further reaction of the precursor in the presence of the catalyst forms oligomeric/polymeric forms of the precursor. | ||||||
| 160 | Polysilazanes and related compositions, processes and uses | US12874 | 1986-12-01 | US5008422A | 1991-04-16 | Yigal D. Blum; Richard M. Laine |
| Silazanes and related compounds are prepared by (a) providing a precursor containing at least one Si-N bond, cleaving an Si-N bond in the precursor in the presence of hydrogen or a hydrogen donor, and reacting the cleavage product with a second cleavage product or with a compound containing an Si-H bond, an N-H bond, or both, to produce an initial silazane product having at least one newly formed Si-N bond or (b) providing one or more reactants which contain an Si-H bond and an N-H bond, and causing reaction to occur between the two bonds in the presence of a transition metal catalyst to form an initial silazane product having newly formed Si-N bonds. Further products may result from additional reaction of either type. Novel compounds, including siloxazanes and high molecular weight polysilazanes, are provided. The compounds may be pyroloyzed to yield ceramic materials such as silicon nitride, silicon carbide and silicon oxynitride. In a preferred embodiment, substantially pure silicon nitride and articles prepared therefrom are provided. Fibers coatings, binders, and the like may be prepared from the novel materials. | ||||||
QQ群二维码
意见反馈
意见反馈