Photocurable organopolysiloxane composition

• US 5,026,741 A
• Filed: 05/30/1989
• Issued: 06/25/1991
• Est. Priority Date: 05/30/1988
• Status: Expired due to Fees

• Current Assignee: Shin-Etsu Chemical Company Limited
• Original Assignee: Shin-Etsu Chemical Company Limited
• Inventors: Satou, Masaharu, Arai, Masatoshi, Fujioka, Kazutoshi
• Primary Examiner(s): McCamish, Marion E.
• Assistant Examiner(s): BERMAN, SUSAN W
• Application Number:
  US07/357,850
• Time in Patent Office: 756 Days
• Field of Search: 522/99, 522/33, 522/172
• US Class Current: 522/33
• CPC Class Codes: C08L 2666/28 Non-macromolecular organic substances
• CPC Class Codes: C08L 83/00 Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 83/06 containing silicon bound to oxygen-containing groups C08L83/12 takes precedence
• CPC Class Codes: C08L 83/14 in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms C08L83/10 takes precedence
• CPC Class Codes: H05K 3/0076 characterised by the composition of the mask

Abstract

A photocurable organopolysiloxane composition comprising an organopolysiloxane having at least one photocurable acryloxyorganosilyl group in the molecule, a polyether-modified organopolysiloxane and a photo-initiator. The composition has good peelable protective properties after curing and heating, for example, in hot solder bath.

Claims

1. A photocurable organopolysiloxane composition comprises:

100 parts by weight of an organopolysiloxane having at least one group of the following general formula (1) in one molecule ##STR12## ##STR13## wherein R¹ represents a hydrogen atom or a methyl group, R², R³ and R⁴ independently represent an unsubstituted or substituted monovalent hydrocarbon group, X represents an ethylene group, and a and b are independently an integer of 1 to 3;

from 0.1 to 20 parts by weight of a polyether-modified organopolysiloxane of the following general formula (2) ##STR14## wherein R¹ represents a hydrogen atom or an unsubstituted or substituted monovalent hydrocarbon group, and o, p, q and r are independently an integer defined such that 0≦

o≦

50, 1≦

p≦

50, 1≦

q≦

100 and 0≦

r≦

100; and

from 0.01 to 10 parts by weight of a photo-initiator.

2. The composition according to claim 1, wherein said organopolysiloxane having at least one group of the general formula (1) is a substantially linear diorganopolysiloxane having the group of the general formula (1) at both ends of the molecular chain.

3. The composition according to claim 1, wherein in the formula (1), R¹ represents a hydrogen atom, R², R³ and R⁴ in the formula (1) are independently a methyl group, a phenyl group, or a 3,3,3-trifluoropropyl group, X represents an ethylene group, a is 1 or 3, and b is 2 or 3.

4. The composition according to claim 1, wherein said organopolysiloxane having at least one group of the general formula (1) is of the following general formula ##STR15## wherein each R represents a methyl group, a phenyl group or a 3,3,3,-trifluoropropyl group, and c is zero or an integer of 1 or over.

5. The composition according to claim 1, wherein said organopolysiloxane having at least one group of the general formula (1) is a compound of the following formula ##STR16## wherein n is an integer of 1 or over.

6. The composition according to claim 1, wherein said organopolysiloxane having at least one group of the general formula (1) is a compound of the following formula ##STR17## wherein m and n are independently zero or an integer of 1 or over provided that m+n≧

1.

7. The composition according to claim 1, wherein said organopolysiloxane having at least one group of the general formula (1) is a compound of the following formula ##STR18## wherein n and m are independently zero or an integer of 1 or over provided that m+n≧

1.

8. The composition according to claim 1, wherein said organopolysiloxane having at least one group of the general formula (1) is a compound of the following formula ##STR19## wherein n and m are independently zero or an integer of 1 or over provided that m+n≧

1.

9. The composition according to claim 1, wherein in the formula (2), R'"'"' represents a hydrogen atom or a lower alkyl group.

10. The composition according to claim 1 wherein said polyether-modified organopolysiloxane is used in an amount of from 1.0 to 10 parts by weight.

11. The composition according to claim 1, wherein said polyether-modified organopolysiloxane is a compound of the following formula ##STR20##

12. The composition according to claim 1, wherein said polyether-modified organopolysiloxane is a compound of the following formula ##STR21##

13. The composition according to claim 1, wherein said polyether-modified organopolysiloxane is a compound of the following formula ##STR22##

14. The composition according to claim 1, wherein said polyether-modified organopolysiloxane is a compound of the following formula ##STR23##

15. A cured product obtained from the composition of claim 1.