High peel strength polysulfide based sealants专利检索-涂料添加剂油漆与涂料专利检索查询-专利查询网

High peel strength polysulfide based sealants

阅读：3发布：2023-10-20

专利汇可以提供High peel strength polysulfide based sealants专利检索，专利查询，专利分析的服务。并且The adhesive characteristics of cured sealant formulations based on polysulfide polymers are substantially improved by the incorporation of glycidyl trialkyloxysilanes. The glycidyl trialkyloxysilanes provide an extremely high peel strength for coatings on various substrates, especially aluminum. The amount of curing agent required is reduced when glycidyl trialkyloxysilanes are used as adhesion-promoting additives.，下面是High peel strength polysulfide based sealants专利的具体信息内容。

权利要求

1. A curable sealant composition comprising, in weight ratio, (a) 100 parts by weight of a curable liquid polythiol having pendent reactive thiol groups, (b) from 0.5-10 parts by weight of an adhesion promoting additive consisting essentially of a glycidyl trialkyloxysilane having the formula wherein Y is O or S, n is an integer in the range of 1-5, m is an integer in the range of 1-5, x is in the range of 0-1, R'' is hydrogen or alkyl having in the range of one to five carbon atoms, the total carbon atoms in all R'' groups per molecule being equal to or less than 10, and wherein R is alkyl having in the range of one to five carbon atoms, and (c0 a curable amount of a curing agent for the polythiol which amount is sufficient to convert at least about 40 weight percent of the pendent reactive thiol groups to polysulfide groups.

2. A composition according to claim 1 wherein the polythiol is a poly(oxyalkylene)-polyester-poly(monosulfide)-polythiol having at least three pendent thiol groups per molecule formed by the reaction of a mercaptoalkanoic acid and a thiodialkanoic acid with a poly(oxyalkylene)-polyol having at least three pendent hydroxy groups per molecule.

3. A composition according to claim 2 wherein said glycidyl trialkyloxysilane is gamma-glycidoxypropyltrimethoxysilane and the curing agent is lead peroxide, the amount of curing agent present being in the range of 2.5 to 7.5 weight parts per 100 weight parts of polythiol.

4. An article of manufacture which is a substrate having on at least one surface thereof a layer, exhibiting a high peel strength bonded thereto, of the sealant composition of claim 1.

5. An article as defined in claim 4 in which said substrate is aluminum.

6. An article as defined in claim 5 wherein said polythiol is a poly(oxyalkylene)-polyester-poly(monosulfide)-polythiol having at least three pendent thiol groups per molecule formed by the reaction of a mercaptoalkanoic acid and a thiodialkanoic acid with a poly(oxyalkylene)-polyol having at least three pendent hydroxy groups per molecule, said glycidyl trialkyloxysilane is gamma-glycidoxypropyltrimethoxysilane, and the curing agent is lead peroxide.

7. An article as defined in claim 4 in which said substrate is concrete.

8. A composition according to claim 1 wherein said glycidyl compound is gamma-glycidoxypropyltrimethoxysilane and the curing agent is a metallic oxide.

9. A composition according to claim 1 wherein the polythiol is a poly(oxyalkylene)-polyester-polythiol having at least three pendent thiol groups per molecule formed by the reaction of a mercaptoalkanoic acid with a poly(oxyalkylene)-polyol having at least three pendent hydroxy groups per molecule.

10. An article of manufacture which is a substrate having on at least one surface thereof a layer, exhibiting a high peel strength bonded thereto, of the sealant composition of claim 2.

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