US4024090A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for molding polyurethane foams
Assignee: Bayer AG
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Filing: 1974-11-06
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Granted: 1977-05-17
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Expires: 1994-11-06
Abstract
Abstract The mold release properties of a molded polyurethane foam are improved by including in the foamable reaction mixture to be molded a reaction product of a polysiloxane and a monocarboxylic acid or polycarboxylic acid.
Inventors
- 👤 Wulf von Bonin
- 👤 Helmut Kleimann
- 👤 Udo Post
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:35
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08L; C08L83/00; C08L83/04; C08L83/06; C08J2375/00; C08J2375/04; C08J2483/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
127 words
In a process for molding foam plastics in a closed mold by foaming a reaction mixture containing an organic polyisocyanate, an organic compound having a molecular weight of about 62 to about 10,000 which has at least two reactive hydrogen atoms, and a blowing agent, the improvement which comprises including in the reaction mixture, as an internal mold release agent, an esterification reaction product of a polysiloxane which contains --CH 2 OH groups which are attached directly to a silicon atom, and a monocarboxylic or polycarboxylic acid, with the proviso that the esterification reaction is conducted in such a manner that in the case of polycarboxylic acids, substantially only one carboxylic group of the polycarboxylic acid is reacted for each --CH 2 OH group of the polysiloxane.
Claim 2
Dependent Claim
127 words
In a process for molding foam plastics in a closed mold by foaming a reaction mixture containing an organic polyisocyanate, an organic compound having a molecular weight of about 62 to about 10,000 which has at least two reactive hydrogen atoms, and a blowing agent, the improvement which comprises including in the reaction mixture, as an internal mold release agent, an esterification reaction product of a polysiloxane which contains --CH 2 OH groups which are attached directly to a silicon atom, and a monocarboxylic or polycarboxylic acid, with the proviso that the esterification reaction is conducted in such a manner that in the case of polycarboxylic acids, substantially only one carboxylic group of the polycarboxylic acid is reacted for each --CH 2 OH group of the polysiloxane.
Claim 3
Dependent Claim
27 words
The process of claim 1, wherein the mold release agent is the reaction product of a polysiloxane which contains --CH 2 --OH groups and a monocarboxylic acid.
Claim 4
Dependent Claim
20 words
The process of claim 2, wherein the monocarboxylic acid is a fatty acid containing from 12 to 20 carbon atoms.
Claim 5
Dependent Claim
25 words
The process of claim 3, wherein the fatty acid is oleic acid, linoleic acid, ricinoleic acid or mixture of two or more of these acids.
Claim 6
Dependent Claim
15 words
The process of claim 1, wherein the carboxylic acid is maleic acid or its anhydride.
Claim 7
Dependent Claim
26 words
The process of claim 1, wherein the polysiloxane is a linear polydimethyl siloxane and has a hydroxyl content of about 2% to about 8% by weight.
Claim 8
Dependent Claim
15 words
The process of claim 1, wherein the polyisocyanate is the phosgenation product of aniline-formaldehyde condensates.
Claim 9
Dependent Claim
11 words
The process of claim 1, wherein the polyisocyanate contains carbodiimide groups.
Claim 10
Dependent Claim
32 words
The process of claim 1, wherein the polyisocyanate is the reaction product of a diol or triol which has a molecular weight of about 62 to about 500 and a monomeric polyisocyanate.
Claim 11
Dependent Claim
17 words
The process of claim 1, wherein a mixture of mold-release agents is added to the reaction mixture.
Claim 12
Dependent Claim
8 words
The product of the process of claim 1.
Claim 13
Dependent Claim
10 words
A foam cushion prepared by the process of claim 1.
Claim 14
Dependent Claim
40 words
The process of claim 1 wherein the polysiloxane is of the formula AR.sub.2 SiO--(R.sub.2 SiO).sub.n --SiR.sub.2 A wherein n has a value of from 1 to 100, R represents methyl and/or phenyl and A represents a --CH 2 OH group.
Claim 15
Dependent Claim
15 words
The process of claim 13 wherein n has a value of from 3 to 20.
Claim 16
Dependent Claim
19 words
The process of claim 1 wherein the polysiloxane is of the formula: ##STR2## wherein n is 3 to 20.
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) | 1980-05-16 | 1980-11-15 | 1981-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-16 | 1984-11-15 | 1985-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-16 | 1988-11-15 | 1989-05-17 | $7700.00 | Window Closed / Lapsed |