EP0373659A2
Expired / Lapsed
EP
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Method for the preparation of polyorganosiloxane and radiation-curable composition
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1989-12-14
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Granted: —
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Expires: 2009-12-14
Abstract
Abstract Polyorganosiloxane having the substructure where R⁸ is a divalent group generated by an addition reaction between SiH and acryloxy, methacryloxy, or alkenyl group and R⁹ is acryloxy, methacryloxy, or alkenyl, is prepared by an addition method in which an organopolysiloxane having two kinds of unsaturated groups selected from acryloxy, methacryloxy, and alkenyl and organohydrogenpolysiloxane are reacted in the presence of a platinum-type catalyst. These organopolysiloxanes are prepared without gelation and the method is highly efficient. Radiation-curable compositions based on the polyorganosiloxane are characterized by a rapid cure upon exposure to radiation, while resisting curing inhibition even in the presence of oxygen, to give a cured material whose cured surface is slightly subject to time-dependent changes, and in particular whose peeling or release force undergoes little variation with the passage of time.
Inventors
- 👤 Hiroshi Masaoka
- 👤 Shosaku Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 12:41
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/24; C08J3/243; C08G; C08G77/00; C08G77/48; C08G77/50; C08L; C08L83/00; C08L83/14; C08J2383/00; C08J2383/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
286 words
A method for the preparation of an polyorganosiloxane comprising an addition reaction, in the presence of a platinum-type catalyst, between (A) organopolysiloxane containing in each molecule at least 1 siloxane unit as represented by the formula R¹ a R²SiO (3-a)/2 and at least 1 siloxane unit as represented by the formula R³ b R⁴SiO (3-b)/2 wherein R¹ and R³ are independently a monovalent hydrocarbon group which does not contain aliphatically unsaturated bonds; R² and R⁴ are independently an unsaturated group selected from the group consisting of acryloxy groups of the formula -R⁵OC(O)CH=CH₂ , methacryloxy groups of the formula -R⁶OC(O)C(CH₃)=CH₂, and alkenyl groups wherein R⁵ and R⁶ are independently an alkylene group, with the proviso that in the molecules of (A) R² and R⁴ are different types of groups; and a and b is 1 or 2 and (B) organohydrogenpolysiloxane having in each molecule at least 1 siloxane unit as represented by R⁷ c HSiO (3-c)/2 wherein R⁷ is a monovalent hydrocarbon group which does not contain aliphatically unsaturated bonds, and c is 1 or 2, producing (C) polyorganosiloxane which contains in each molecule at least one substructure as represented by wherein R⁸ is a divalent organic group generated by an addition reaction between the SiH group of organohydrogenpolysiloxane (B) and an unsaturated group of organopolysiloxane (A) selected from the group consisting of acryloxy groups of the formula -R⁵OC(O)CH=CH₂ , methacryloxy groups of the formula -R⁶OC(O)C(CH₃)=CH₂ , or alkenyl groups wherein R⁵ and R⁶ are alkylene groups; R⁹ is an unsaturated group selected from the group consisting of acryloxy groups of the formula -R⁵OC(O)CH=CH₂ , methacryloxy groups of the formula -R⁶OC(O)C(CH₃)=CH₂ , and alkenyl groups; and m is an integer with a value of at least zero.
Claim 2
Independent Claim
286 words
A method for the preparation of an polyorganosiloxane comprising an addition reaction, in the presence of a platinum-type catalyst, between (A) organopolysiloxane containing in each molecule at least 1 siloxane unit as represented by the formula R¹ a R²SiO (3-a)/2 and at least 1 siloxane unit as represented by the formula R³ b R⁴SiO (3-b)/2 wherein R¹ and R³ are independently a monovalent hydrocarbon group which does not contain aliphatically unsaturated bonds; R² and R⁴ are independently an unsaturated group selected from the group consisting of acryloxy groups of the formula -R⁵OC(O)CH=CH₂ , methacryloxy groups of the formula -R⁶OC(O)C(CH₃)=CH₂, and alkenyl groups wherein R⁵ and R⁶ are independently an alkylene group, with the proviso that in the molecules of (A) R² and R⁴ are different types of groups; and a and b is 1 or 2 and (B) organohydrogenpolysiloxane having in each molecule at least 1 siloxane unit as represented by R⁷ c HSiO (3-c)/2 wherein R⁷ is a monovalent hydrocarbon group which does not contain aliphatically unsaturated bonds, and c is 1 or 2, producing (C) polyorganosiloxane which contains in each molecule at least one substructure as represented by wherein R⁸ is a divalent organic group generated by an addition reaction between the SiH group of organohydrogenpolysiloxane (B) and an unsaturated group of organopolysiloxane (A) selected from the group consisting of acryloxy groups of the formula -R⁵OC(O)CH=CH₂ , methacryloxy groups of the formula -R⁶OC(O)C(CH₃)=CH₂ , or alkenyl groups wherein R⁵ and R⁶ are alkylene groups; R⁹ is an unsaturated group selected from the group consisting of acryloxy groups of the formula -R⁵OC(O)CH=CH₂ , methacryloxy groups of the formula -R⁶OC(O)C(CH₃)=CH₂ , and alkenyl groups; and m is an integer with a value of at least zero.
Claim 3
Dependent Claim
10 words
A radiation-curable composition based on polyorganosiloxane according to claim 1.
Claim 4
Dependent Claim
109 words
A polyorganosiloxane comprising in each molecule at least one substructure as represented by wherein R⁸ is a divalent organic group generated by an addition reaction between the SiH group of organohydrogenpolysiloxane (B) and an unsaturated group of organopolysiloxane (A) selected from the group consisting of acryloxy groups of the formula -R⁵OC(O)CH=CH₂ , methacryloxy groups of the formula -R⁶OC(O)C(CH₃)=CH₂ , or alkenyl groups wherein R⁵ and R⁶ are alkylene groups; R⁹ is an unsaturated group selected from the group consisting of acryloxy groups of the formula -R⁵OC(O)CH=CH₂ , methacryloxy groups of the formula -R⁶OC(O)C(CH₃)=CH₂ , and alkenyl groups; and m is an integer with a value of at least zero.
Claim 5
Dependent Claim
109 words
A polyorganosiloxane comprising in each molecule at least one substructure as represented by wherein R⁸ is a divalent organic group generated by an addition reaction between the SiH group of organohydrogenpolysiloxane (B) and an unsaturated group of organopolysiloxane (A) selected from the group consisting of acryloxy groups of the formula -R⁵OC(O)CH=CH₂ , methacryloxy groups of the formula -R⁶OC(O)C(CH₃)=CH₂ , or alkenyl groups wherein R⁵ and R⁶ are alkylene groups; R⁹ is an unsaturated group selected from the group consisting of acryloxy groups of the formula -R⁵OC(O)CH=CH₂ , methacryloxy groups of the formula -R⁶OC(O)C(CH₃)=CH₂ , and alkenyl groups; and m is an integer with a value of at least zero.
Claim 6
Dependent Claim
87 words
The polyorganosiloxane in accordance with claim 10 in which the substructure is represented by the formula in which (1) is bonded to R⁷ or an oxygen atom, (2) is bonded to R⁷, (3) is bonded to a silicon atom forming the siloxane chain, (4) and (7) are R¹ or R³, (5), (6), (8), and (9) are either R¹, R³ or is bonded to an oxygen atom to form a siloxane chain, and (8) and (9) may form a cyclic via an oxygen atom or an organopolysiloxanylene group.
References Cited (Backward Citations)
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