This invention relates to processes for the production of symmetrical polyurea-urethane coated granular fertilizer products, and to the symmetrical polyurea-urethane coated granular fertilizer products produced by these processes. These processes comprise coating fertilizer granules with compounds which react to form urethane coatings which contain terminal isocyanate groups, followed by polymerization of these urethanes to form symmetrical polyurea-urethanes. Suitable compounds comprise a) an organic polyisocyanate component, and b) an alkanol-amine component containing at least one tertiary amine group and at least one hydroxyl group. These compounds are present in sufficient quantities that the molar ratio of isocyanate groups to isocyanate-reactive groups is from about 1.6:1.0 up to about 10.0:1.0 in each encapsulating layer. It is necessary that sufficient amounts of these compounds are applied to the fertilizer granules such that the symmetrical polyurea-urethane coated granular fertilizer particles contain from about 0.5 to about 15% by weight of polyurea-urethane, based on the total weight of the encapsulated fertilizer particles.

Die Erfindung betrifft ein Verfahren zur Herstellung von offenzelligen, hydrophilen Polyurethanschaumstoffen mit einer Dichte von 10 bis 60 kg/m³ durch Umsetzung von Polyisocyanaten mit Verbindungen mit mindestens zwei gegenüber Isocyanaten reaktionsfähigen Wasserstoffatomen und einem Molekulargewicht von 400 bis 10.000 in Gegen­wart von Wasser als Treibmittel sowie gegebenenfalls in Gegenwart von Verbindungen mit mindestens zwei gegenüber Isocyanaten reaktionsfähigen Wasserstoffatomen und einem Molekulargewicht von 32 bis 399 und gegebenenfalls in Gegenwart von Hilfs- und Zusatzmitteln, dadurch gekenn­zeichnet, daß 5 bis 20 mmol Säure, bezogen auf 100 g Gemisch aus Polyhydroxylverbindungen, Wasser und ggf. Zusatzmitteln, mitverwendet werden.

Die Erfindung betrifft ein Verfahren zur Herstellung von offenzelligen, hydrophilen Polyurethanschaumstoffen mit einer Dichte von 10 bis 60 kg/m³ durch Umsetzung von Polyisocyanaten mit Verbindungen mit mindestens zwei gegenüber Isocyanaten reaktionsfähigen Wasserstoffatomen und einem Molekulargewicht von 400 bis 10.000 in Gegen­wart von Wasser als Treibmittel sowie gegebenenfalls in Gegenwart von Verbindungen mit mindestens zwei gegenüber Isocyanaten reaktionsfähigen Wasserstoffatomen und einem Molekulargewicht von 32 bis 399 und gegebenenfalls in Gegenwart von Hilfs- und Zusatzmitteln, dadurch gekenn­zeichnet, daß 5 bis 20 mmol Säure, bezogen auf 100 g Gemisch aus Polyhydroxylverbindungen, Wasser und ggf. Zusatzmitteln, mitverwendet werden.

A method for the preparation of open-celled hydrophilic polyurethane foam which comprises reacting a liquid MDI composition with a polyol component comprising :

• 1) an oxyalkylation product of ethylene diamine having a hydroxyl number of from 600 to 850;
• 2) a polyoxyalkylene triol having a hydroxyl number of from 28 to 56, and
• 3) a polyethylene glycol monoalkyl ether having a molecular weight of from 300 to 1000,
  
  and a blowing agent comprising water and optionally a low boiling point halogenated hydrocarbon, the weight of polyethylene glycol monoalkyl ether being at least four times the weight of water and the isocyanate index being in the range from 25 to 90.

To provide a polycarbonate resin excellent in heat resistance, transparency, light resistance, weather resistance and mechanical strength. The present invention relates to a polycarbonate resin containing, in the molecule, a structure represented by the following formula (1). (In the formula (1), X has a structure represented by any one of the following formulae (2) to (4). In the formulae (2) to (4), each of R¹ to R⁴ independently represents a hydrogen atom or an organic group having a carbon number of 1 to 30. The organic group may have an arbitrary substituent, and any two or more members of R¹ to R⁴ may combine with each other to form a ring).

Polyurethane foam flakes for use as additive to soil and/or other natural plant growth media for improving the water retention and/or reduction of the methane emission.

Provided is a biodegradable resin including a urethane bond generated by a reaction of a polyester polymer with a polyvalent isocyanate used as a chain extender. Particularly, provided is a method of preparing a biodegradable resin using a limited amount of the chain extender and having excellent properties, and a biodegradable resin in which nitrogen content is controlled. Therefore, the biodegradable resin which can reduce the use of a harmful component to the human body and environment in the process of preparing the biodegradable resin and can be safely used for packing materials for food or medicine is provided.

The object is to provide a molded product of foamed particles obtained by charging biodegradable resin foamed particles which are of vegetable origin and excellent in environmental compatibility into a mold, followed by heat molding, which molded product is not accompanied by post shrinkage after the molding with a wide range of variation of processing in the molding. Further, P3HA resin foamed particles being composed of a resin composition that comprises an isocyanate compound, and a polymer, poly(3-hydroxyalkanoate), having a recurring unit represented by the general formula (1):



        [-O-CHR-CH₂-CO-]     (1)



(wherein R represents an alkyl group represented by C_nH_2n+1, wherein n is an integer of from 1 to 15) produced by a microorganism are provided.

A high molecular weight aliphatic polyester copolymer, a high molecular weight aliphatic polyester copolymer containing polylactic acid; process for industrially producing these copolymers; composition of these copolymers; and various uses thereof. These copolymers have practical properties which make the copolymers moldable. They are free from the problem of plasticizer bleeding and can be degraded by microorganisms present in soils or water. They give moldings, such as sheets and films, which combine a sufficient strength with tear resistance. When the copolymers are ones having a branched structure, they give a molding having excellent mechanical properties. The moldings obtained from compositions containing either of these copolymers are excellent in elongation and biodegradability and have a satisfactory balanc therebetween. In particular, blending with one or more other biodegradable resins gives a molding having better moldability.

Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung von festen, Nährstoffe für Pflanzen enthaltenden Mitteln mit wenigsten einer biologisch abbaubaren Polymerschicht, die hergestellt wird, indem man Dispersionen, enthaltend Polymere, die Urethan- und Harnstoffgruppen aufweisen, zur oberflächigen Behandlung von festen, Nährstoffe für Pflanzen enthaltenden Mitteln einsetzt.

This invention relates to processes for the production of symmetrical polyurea-urethane coated granular fertilizer products, and to the symmetrical polyurea-urethane coated granular fertilizer products produced by these processes. These processes comprise coating fertilizer granules with compounds which react to form urethane coatings which contain terminal isocyanate groups, followed by polymerization of these urethanes to form symmetrical polyurea-urethanes. Suitable compounds comprise a) an organic polyisocyanate component, and b) an alkanol-amine component containing at least one tertiary amine group and at least one hydroxyl group. These compounds are present in sufficient quantities that the molar ratio of isocyanate groups to isocyanate-reactive groups is from about 1.6:1.0 up to about 10.0:1.0 in each encapsulating layer. It is necessary that sufficient amounts of these compounds are applied to the fertilizer granules such that the symmetrical polyurea-urethane coated granular fertilizer particles contain from about 0.5 to about 15% by weight of polyurea-urethane, based on the total weight of the encapsulated fertilizer particles.

A method of growing a plant, which comprises growing the plant mat consisting of an open-cell polyurethane foam comrising from 10 to 50% by weight of ethyleneoxy residues and having a density in the range of from 15 to 30 kilogrammes per cubic metre and a mean number of cells per centimetre in the range of from 10 to 25, a polyurethane foam for use in the method, and a process for preparing the polyurethane foam.