EP0112168A2
Expired / Lapsed
EP
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Silicone-type coating resin solution and its preparation
Assignee: Fujitsu Ltd
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Filing: 1983-12-14
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Granted: —
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Expires: 2003-12-14
Abstract
Abstract @ A silicone-type coating resin solution and a process for preparing the solution. This solution comprises 30 to 60 parts by weight of a hydrolytic condensation polymer of tetramethoxysilane or tetraethoxysilane (PDAS) having a weight average molecular weight of 1,000 to 6,000 and 70 to 40 parts by weight of a polysilsesquioxane prepolymer (PLOS) having a weight average molecular weight of 2,500 to 7,000 and in which 5 to 50 mole% of the organic groups attached directly to the silicon atoms is a phenyl group and the remaining organic groups are methyl, ethyl, or vinyl groups, these polymer component being dissolved in an organic solvent having a boiling point of not less than 110°C under a pressure of 760 mmHg. This solution is prepared by dissolving PDAS and PLOS in an organic solvent having a high boiling point and treating the resultant solution under a reduced pressure of not more than 5 mmHg.
Inventors
- 👤 Shiro Takeda
- 👤 Minoru Nakajima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 19:32
CPC Classifications
C; C09; C09D; C09D183/00; C09D183/10; C08; C08G; C08G77/00; C08G77/42; C08G77/44
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
134 words
A silicone-type coating resin solution comprising a hydrolytic condensation polymer of tetramethoxysilane or tetraethoxysilane and a polysilsesquioxane prepolymer, the polymer component being dissolved in an organic solvent having a boiling point of not less than 110°C under a pressure of 760 mmHg, characterised in that the solution contains 30 to 60 parts by weight of the said hydrolytic condensation polymer and 70 to 40 parts by weight of the said prepolymer, the said hydrolytic condensation polymer has a weight average molecular weight of 1000 to 6000 and the said polysilsesquioxane prepolymer has a weight average molecular weight of 2500 to 7000 and in this prepolymer 5 to 50 mole % of the organic groups attached directly to the silicon atoms are phenyl groups and the remaining organic groups are methyl, ethyl or vinyl groups.
Claim 2
Dependent Claim
134 words
A silicone-type coating resin solution comprising a hydrolytic condensation polymer of tetramethoxysilane or tetraethoxysilane and a polysilsesquioxane prepolymer, the polymer component being dissolved in an organic solvent having a boiling point of not less than 110°C under a pressure of 760 mmHg, characterised in that the solution contains 30 to 60 parts by weight of the said hydrolytic condensation polymer and 70 to 40 parts by weight of the said prepolymer, the said hydrolytic condensation polymer has a weight average molecular weight of 1000 to 6000 and the said polysilsesquioxane prepolymer has a weight average molecular weight of 2500 to 7000 and in this prepolymer 5 to 50 mole % of the organic groups attached directly to the silicon atoms are phenyl groups and the remaining organic groups are methyl, ethyl or vinyl groups.
Claim 3
Dependent Claim
19 words
A solution according to to claim 1, characterised in that the halogen content is not greater than 10 ppm.
Claim 4
Dependent Claim
43 words
A solution according to claim 1 or claim 2, characterised in that the organic solvent is a cellosolve acetate, preferably methyl cellosolve acetate or ethyl cellosolve acetate or butyl cellosolve acetate, a ketone, preferably methyl isobutyl ketone, or an alcohol, preferably n-butyl alcohol.
Claim 5
Dependent Claim
17 words
A solution according to any preceding claim, characterised in that the organic solvent is butyl cellosolve acetate.
Claim 6
Dependent Claim
23 words
A solution according to any preceding claim, characterised in that it has a total solids concentration of from 20 to 50% by weight.
Claim 7
Dependent Claim
36 words
A solution according to any preceding claim, characterised in that the weight average molecular weight of the condensation polymer is at least 1600 and the weight average molecular weight of the prepolymer is at least 3000.
Claim 8
Dependent Claim
31 words
A solution according to any preceding claim, characterised in that 10 to 40 mole % of the organic groups attached directly to the silicon atoms in the prepolymer are phenyl groups.
Claim 9
Dependent Claim
168 words
A process for producing a silicone-type coating resin solution comprising a hydrolytic condensation polymer of tetramethoxysilane or tetraethoxysilane and a polysilsesquioxane prepolymer, the solution having a solids concentration of 20 to 50 % by weight and the polymer component being dissolved in an organic solvent having a boiling point of not less than 1100C under a pressure of 760 mmHg, characterised in that the hydrolytic condensation polymer has a weight average molecular weight of 1000 to 6000, the polysilsesquioxane prepolymer has a weight average molecular weight of 2500 to 7000 and in this prepolymer 5 to 50 mole % of the organic groups attached directly to the silicon atoms is a phenyl groups and the remaining organic groups are methyl, ethyl or vinyl groups, and the method comprises dissolving 30 to 60 parts by weight of the hydrolytic condensation polymer and 70 to 40 parts by weight of the prepolymer in the solvent and treating the resultant solution under a reduced pressure of not greater than 5 mmHg.
Claim 10
Dependent Claim
168 words
A process for producing a silicone-type coating resin solution comprising a hydrolytic condensation polymer of tetramethoxysilane or tetraethoxysilane and a polysilsesquioxane prepolymer, the solution having a solids concentration of 20 to 50 % by weight and the polymer component being dissolved in an organic solvent having a boiling point of not less than 1100C under a pressure of 760 mmHg, characterised in that the hydrolytic condensation polymer has a weight average molecular weight of 1000 to 6000, the polysilsesquioxane prepolymer has a weight average molecular weight of 2500 to 7000 and in this prepolymer 5 to 50 mole % of the organic groups attached directly to the silicon atoms is a phenyl groups and the remaining organic groups are methyl, ethyl or vinyl groups, and the method comprises dissolving 30 to 60 parts by weight of the hydrolytic condensation polymer and 70 to 40 parts by weight of the prepolymer in the solvent and treating the resultant solution under a reduced pressure of not greater than 5 mmHg.
Claim 11
Dependent Claim
164 words
A process for producing a silicone-type coating resin solution comprising a hydrolytic condensation polymer of tetramethoxysilane or tetraethoxysilane and a polysilsesquioxane prepolymer, the solution having a solids concentration of 20 to 50 % by weight and the polymer component being dissolved in an organic solvent having a boiling point of not less than 110°C under a pressure of 760 mmHg, characterised in that the hydrolytic condensation polymer has a weight average molecular weight of 1000 to 6000, the polysilsesquioxane prepolymer has a weight average molecular weight of 2500 to 7000 and in this prepolymer 5 to 50 mole % of the organic groups attached directly to the silicon atoms is a phenyl group and the remaining organic groups are methyl, ethyl or vinyl groups, the method comprising dissolving the hydrolytic condensation polymer in the solvent, treating the resultant solution under a reduced pressure of not greater than 5 mmHg and mixing the resultant solution with a solution in the solvent of the said prepolymer.
Claim 12
Dependent Claim
164 words
A process for producing a silicone-type coating resin solution comprising a hydrolytic condensation polymer of tetramethoxysilane or tetraethoxysilane and a polysilsesquioxane prepolymer, the solution having a solids concentration of 20 to 50 % by weight and the polymer component being dissolved in an organic solvent having a boiling point of not less than 110°C under a pressure of 760 mmHg, characterised in that the hydrolytic condensation polymer has a weight average molecular weight of 1000 to 6000, the polysilsesquioxane prepolymer has a weight average molecular weight of 2500 to 7000 and in this prepolymer 5 to 50 mole % of the organic groups attached directly to the silicon atoms is a phenyl group and the remaining organic groups are methyl, ethyl or vinyl groups, the method comprising dissolving the hydrolytic condensation polymer in the solvent, treating the resultant solution under a reduced pressure of not greater than 5 mmHg and mixing the resultant solution with a solution in the solvent of the said prepolymer.
Claim 13
Dependent Claim
48 words
A process according to claim 8 or claim 9, in which the treatment under a reduced pressure of not greater than 5 mmHg is conducted at a temperature of not more than 40°C, preferably 5 to 28°C, at a pressure that preferably is not more than 3 mmHg.
Claim 14
Dependent Claim
27 words
A process of forming a silicone-type coating by spin coating a solution, characterised in that the solution is a solution according to any claims 1 to 7.
References Cited (Backward Citations)
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