US4772515A
Expired / Lapsed
US
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Releasing silicone composition comprising an organopolysiloxane having at least two specific organosiloxy groups in the molecule
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1987-07-20
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Granted: 1988-09-20
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Expires: 2007-07-20
Abstract
Abstract A releasing silicone composition comprising three ingredients including an organopolysiloxane having at least two specific organosiloxy units having an alkenyl group, a methylhydrogenpolysiloxane material, and a platinum catalyst.
Inventors
- 👤 Yasuaki Hara
- 👤 Kazuma Momii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:39
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/10; D21H19/14; D21H19/24; D21H19/32; C; C08; C08J; C08J7/00; C08J7/04; C08J7/0427; C08J7/043; C08J7/046; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/14; C08G77/16; C08G77/20; C08J2483/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
102 words
A releasing silicone composition which comprises: 100 parts by weight of an organopolysiloxane having, in one molecule, at least two units of the following general formula (1) ##STR18## in which R 1 represents an alkenyl group, each R 2 , each R 3 and R 4 independently represent a hydrogen atom, a hydroxyl group or a monovalent organic group, and m is an integer of from 0 to 300, the organopolysiloxane having a viscosity of from 2 to 10,000 centistokes at 25° C.; from 10 to 100 parts by weight of a organohydrogen-polysiloxane; and a platinum catalyst used in a catalytic amount.
Claim 2
Dependent Claim
102 words
A releasing silicone composition which comprises: 100 parts by weight of an organopolysiloxane having, in one molecule, at least two units of the following general formula (1) ##STR18## in which R 1 represents an alkenyl group, each R 2 , each R 3 and R 4 independently represent a hydrogen atom, a hydroxyl group or a monovalent organic group, and m is an integer of from 0 to 300, the organopolysiloxane having a viscosity of from 2 to 10,000 centistokes at 25° C.; from 10 to 100 parts by weight of a organohydrogen-polysiloxane; and a platinum catalyst used in a catalytic amount.
Claim 3
Dependent Claim
23 words
A releasing silicone composition according to claim 1, wherein R 2 , R 3 and R 4 are independently a monovalent organic group.
Claim 4
Dependent Claim
27 words
A releasing silicone composition according to claim 1, wherein at least 80% of the total number of R 2 and R 3 consists of a methyl group.
Claim 5
Dependent Claim
26 words
A releasing silicone composition according to claim 1, wherein the content of the alkenyl group is in the range of from 0.5 to 40 mole %.
Claim 6
Dependent Claim
22 words
A releasing silicone composition according to claim 4, wherein the content is in the range of from 1.0 to 30 mole %.
Claim 7
Dependent Claim
23 words
A releasing silicone composition according to claim 1, wherein said organopolysiloxane has a viscosity of from 2 to 10,000 centistokes at 25° C.
Claim 8
Dependent Claim
28 words
A releasing silicone composition according to claim 1, wherein said organohydrogenpolysiloxane is a methylhydrogenpolysiloxane which has at least two hydrogen atoms joined to silicon atoms in the molecule.
Claim 9
Dependent Claim
26 words
A releasing silicone composition according to claim 7, wherein the organohydrogenpolysiloxane has 80 mole % of methyl groups other than the at least two hydrogen atoms.
Claim 10
Dependent Claim
23 words
A releasing silicone composition according to claim 1, wherein said methylhydrogenpolysiloxane is a polymer of recurring units of the formula, --(CH 3 )HSiO--.
Claim 11
Dependent Claim
14 words
A releasing silicone composition according to claim 1, wherein said platinum catalyst is platinum.
Claim 12
Dependent Claim
16 words
A releasing silicone composition according to claim 1, wherein said platinum catalyst is a platinum compound.
Claim 13
Dependent Claim
25 words
A releasing silicone composition according to claim 11, wherein said platinum compound is a complex salt of chloroplatinic acid and an olefin or vinyl siloxane.
Claim 14
Dependent Claim
25 words
A releasing silicone composition according to claim 1, wherein said catalyst is used in an amount of from 1 to 1,000 ppm calculated as platinum.
Claim 15
Dependent Claim
20 words
A releasing article of a plastic film or metallic foil having a cured layer of the composition of claim 1.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-20 | 1992-03-21 | 1992-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-20 | 1996-03-21 | 1996-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-20 | 2000-03-21 | 2000-09-20 | $7700.00 | Window Closed / Lapsed |