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Patent US4871781A successfully refreshed from Google Patents.
US4871781A
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Polydiorganosiloxanes which can be cured to form elastomeric foams
Assignee: Wacker Chemie AG
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Filing: 1988-04-15
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Granted: 1989-10-03
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Expires: 2008-04-15
Abstract
Abstract The invention relates to compositions comprising (A) polydiorganosiloxanes containing vinyl groups, (B) polyorganohydrogensiloxanes, (C) platinum catalysts, and (D) a saturated polyhydric alcohol having at least two hydroxyl groups per molecule, which can be cured at temperatures of from room temperature to over 100° C. by the addition of the Si-bonded H atoms in the polyorganohydrogensiloxane (B) to the vinyl groups in the polydiorganosiloxanes (A) with the aid of the platinum catalysts (C), to form elastomeric foams. The density and type of pores may be controlled by compound (D) containing hydroxyl groups as a "blowing agent".
Inventors
- 👤 Carlos Weise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:21
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/142; C08J2383/00; C08J2383/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
81 words
A composition which can be cured to form elastomeric foams consisting essentially of (A) polydiorganosiloxanes having vinyl groups, (B) polyorganohydrogensiloxanes having terminal groups which are selected from the group consisting of hydrogen, alkyl radicals having from 1 to 8 carbon atoms, aryl radicals and fluoroalkyl radicals having from 3 to 8 carbon atoms, (C) a platinum catalyst, and (D) a saturated polyhydric alcohol which is free of carbonyl groups and Si atoms and contains at least two hydroxyl groups per molecule.
Claim 2
Dependent Claim
81 words
A composition which can be cured to form elastomeric foams consisting essentially of (A) polydiorganosiloxanes having vinyl groups, (B) polyorganohydrogensiloxanes having terminal groups which are selected from the group consisting of hydrogen, alkyl radicals having from 1 to 8 carbon atoms, aryl radicals and fluoroalkyl radicals having from 3 to 8 carbon atoms, (C) a platinum catalyst, and (D) a saturated polyhydric alcohol which is free of carbonyl groups and Si atoms and contains at least two hydroxyl groups per molecule.
Claim 3
Dependent Claim
24 words
The composition of claim 1 in which the polyhydric alcohol (D) is selected from the group consisting of aliphatic dihydric alcohols and trihydric alcohols.
Claim 4
Dependent Claim
14 words
The composition of claim 2 in which the polyhydric alcohol (D) is ethylene glycol.
Claim 5
Dependent Claim
13 words
The composition of claim 2 in which the polyhydric alcohol (D) is glycerol.
Claim 6
Dependent Claim
11 words
The composition of claim 1, wherein the composition contains curing inhibitors.
Claim 7
Dependent Claim
78 words
The composition of claim 1, which contains 100 parts by weight of polydiorganosiloxanes (A) having vinyl groups, 0.01 to 50 parts by weight of polyorganohydrogensiloxanes (B), 0.1 to 200 ppm of platinum as the platinum catalyst (C) and 0.01 to 10 parts by weight of a saturated, polyhydric alcohol (D), the amount of polyhydric alcohol (D) being such that the hydroxyl group content is from 0.05 to 2.0 parts by weight per 100 parts by weight of (A).
Claim 8
Dependent Claim
158 words
A process for preparing an elastomeric foam from polydiorganosiloxanes as the result of crosslinking by the addition reaction, which consists essentially of mixing together 100 parts by weight of polydiorganosiloxanes (A) containing vinyl groups, 0.01 to 50 parts by weight of polyorganohydrogensiloxanes having terminal groups which are selected from the group consisting of hydrogen, alkyl radicals having from 1 to 8 carbon atoms, aryl radicals and fluoroalkyl radicals having from 3 to 8 carbon atoms (B), 0.1 to 200 ppm of platinum as the platinum catalyst (C), 0.01 to 10 parts by weight of a saturated polyhydric alcohol (D), which is free of carbonyl groups and Si atoms and contains at least two hydroxyl groups per molecule, from 5 to 40 parts by weight of a reinforcing filler and from 0 to 150 parts by weight of non-reinforcing filler, and thereafter curing the resultant. mixture at temperatures of from 100° to 200° C. to form the elastomeric foam.
Claim 9
Dependent Claim
158 words
A process for preparing an elastomeric foam from polydiorganosiloxanes as the result of crosslinking by the addition reaction, which consists essentially of mixing together 100 parts by weight of polydiorganosiloxanes (A) containing vinyl groups, 0.01 to 50 parts by weight of polyorganohydrogensiloxanes having terminal groups which are selected from the group consisting of hydrogen, alkyl radicals having from 1 to 8 carbon atoms, aryl radicals and fluoroalkyl radicals having from 3 to 8 carbon atoms (B), 0.1 to 200 ppm of platinum as the platinum catalyst (C), 0.01 to 10 parts by weight of a saturated polyhydric alcohol (D), which is free of carbonyl groups and Si atoms and contains at least two hydroxyl groups per molecule, from 5 to 40 parts by weight of a reinforcing filler and from 0 to 150 parts by weight of non-reinforcing filler, and thereafter curing the resultant. mixture at temperatures of from 100° to 200° C. to form the elastomeric foam.
Claim 10
Dependent Claim
29 words
The composition of claim 1, wherein the composition contains from 5 to 40 parts by weight of a reinforcing filler, based on 100 parts by weight of polydiorganosiloxanes (A).
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) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |