US4359369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photocurable organopolysiloxane compositions
Assignee: Shin-Etsu Chemical Co Ltd
•
Filing: 1980-08-25
•
Granted: 1982-11-16
•
Expires: 2000-08-25
Abstract
Abstract The invention provides a novel photocurable organopolysiloxane composition having an unusually high photosensitivity suitable, for example, for providing an anti-sticking layer on a release paper. The composition comprises an organopolysiloxane having, in a molecule, at least one thioacyloxy-containing organosiloxane unit as the photosensitive functional group and a photosensitizer. Further improved photocurable composition of the invention comprises an organopolysiloxane having, in addition to the above mentioned thioacyloxy-containing organosiloxane units, at least one mercaptohydrocarbyl-containing organosiloxane unit in a molecule. Alternatively, photosensitivity of the similar degree is obtained when the composition comprises a first organopolysiloxane having, in a molecule, at least one thioacyloxy-containing organosiloxane unit and a second organopolysiloxane having, in a molecule, at least one mercaptohydrocarbyl-containing organosiloxane unit as combined.
Inventors
- 👤 Minoru Takamizawa
- 👤 Fumio Okada
- 👤 Yasuaki Hara
- 👤 Hsashi Aoki
- 👤 Yoshio Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:35
CPC Classifications
C; C08; C08L; C08L83/00; C08L83/04; C08L83/08; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/28; C08G77/38; C08G77/382; C08G77/392; G; G03; G03F; G03F7/00; G03F7/004; G03F7/075; G03F7/0757; Y; Y10; Y10S; Y10S522/00; Y10S522/904; Y10S522/905
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
91 words
A photocurable organopolysiloxane composition which comprises (a) an organopolysiloxane containing, in a molecule, at least one thioacyloxy-containing organosiloxane unit represented by the general formula ##EQU3## wherein R 1 is a hydrogen atom or a halogen-substituted or unsubstituted phenyl group, R 2 is a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, R 3 is a halogen-substituted or unsubstituted divalent hydrocarbon group, R 4 is a halogen-substituted or unsubstituted monovalent hydrocarbon group and a is zero, 1 or 2, and (b) an effective amount of a photosensitizer.
Claim 2
Dependent Claim
91 words
A photocurable organopolysiloxane composition which comprises (a) an organopolysiloxane containing, in a molecule, at least one thioacyloxy-containing organosiloxane unit represented by the general formula ##EQU3## wherein R 1 is a hydrogen atom or a halogen-substituted or unsubstituted phenyl group, R 2 is a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, R 3 is a halogen-substituted or unsubstituted divalent hydrocarbon group, R 4 is a halogen-substituted or unsubstituted monovalent hydrocarbon group and a is zero, 1 or 2, and (b) an effective amount of a photosensitizer.
Claim 3
Dependent Claim
51 words
The photocurable organopolysiloxane composition as claimed in claim 1 wherein the organopolysiloxane further contains, in a molecule, at least one mercaptohydrocarbyl-containing organosiloxane unit represented by the general formula ##EQU4## wherein R 5 is a divalent hydrocarbon group, R 6 is a monovalent hydrocarbon group and b is zero, 1 or 2.
Claim 4
Dependent Claim
53 words
The photocurable organopolysiloxane composition as claimed in claim 1 which further comprises a second organopolysiloxane containing, in a molecule, at least one mercaptohydrocarbyl-containing organosiloxane unit represented by the general formula ##EQU5## wherein R 5 is a divalent hydrocarbon group, R 6 is a monovalent hydrocarbon group and b is zero, 1 or 2.
Claim 5
Dependent Claim
23 words
The photocurable organopolysiloxane composition as claimed in claim 1 or claim 2 wherein R 1 and R 2 are each a hydrogen atom.
Claim 6
Dependent Claim
28 words
The photocurable organopolysiloxane composition as claimed in claim 1, claim 2 or claim 3 wherein R 1 is a hydrogen atom and R 2 is a methyl group.
Claim 7
Dependent Claim
28 words
The photocurable organopolysiloxane composition as claimed in claim 1, claim 2 or claim 3 wherein R 1 is a phenyl group and R 2 is a hydrogen atom.
Claim 8
Dependent Claim
21 words
The photocurable organopolysiloxane composition as claimed in claim 1, claim 2 or claim 3 wherein R 3 is a propylene group.
Claim 9
Dependent Claim
19 words
The photocurable organopolysiloxane composition as claimed in claim 2 or claim 3 wherein R 5 is a propylene group.
Claim 10
Dependent Claim
57 words
The photocurable organopolysiloxane composition as claimed in claim 1 wherein at least 95% in number of the organic groups bonded to the silicon atoms in the organopolysiloxane other than the thioacyloxy-containing groups expressed by the formula ##STR32## where R 1 , R 2 and R 3 each have the same meaning as defined above, are methyl groups.
Claim 11
Dependent Claim
82 words
The photocurable organopolysiloxane composition as claimed in claim 2 or claim 3 wherein at least 95% in number of the organic group bonded to the silicon atoms in the organopolysiloxane or organopolysiloxanes other than the thioacyloxy-containing groups expressed by the formula ##STR33## where R 1 , R 2 and R 3 each have the same meaning as defined above, and the mercaptohydrocarbyl groups expressed by the formula HS--R.sup.5 --, where R 5 has the same meaning as defined above, are methyl groups.
Claim 12
Dependent Claim
66 words
The photocurable organopolysiloxane composition as claimed in claim 3 wherein the ratio of the amounts of the organopolysiloxane containing, in a molecule, at least one thioacyloxy-containing organosiloxane unit and the organopolysiloxane containing, in a molecule, at least one mercaptohydrocarbyl-containing organosiloxane unit is in the range such that the molar ratio of the thioacyloxy groups to the mercaptohydrocarbyl groups is in the range from 1:100 to 100:1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-15 | 1986-05-17 | 1986-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-15 | 1990-05-17 | 1990-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-15 | 1994-05-17 | 1994-11-16 | $7700.00 | Window Closed / Lapsed |