Patent US4957298A successfully refreshed from Google Patents.
US4276385A
Expired / Lapsed
US
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Process for preparing cold-cured molded polyurethane flexible from a high molecular weight siloxane and a solvent
Assignee: BP Chemicals Ltd
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Filing: 1980-04-18
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Granted: 1981-06-30
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Expires: 2000-04-18
Abstract
Abstract Cold-cured molded polyurethane flexible foams having improved vibration damping properities are made by foaming in the presence of (1) a high molecular weight predominantly linear siloxane polyoxyalkylene block copolymer and (2) a solvent which is compatible with the block copolymer and which has a viscosity of 3 to 100 cps and a surface tension between 15 to 60 dynes/cm.
Inventors
- 👤 Rudolf J. Tenhagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:41
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/2805; C08G18/2815; C08G18/283; C08G18/2835; C08L; C08L83/00; C08L83/10; C08L83/12; C08G2110/00; C08G2110/0008; C08G2110/0083; C08G2350/00; C08J2375/00; C08J2375/04; C08J2483/00; Y; Y10; Y10S; Y10S521/00; Y10S521/904; Y10S521/918
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
133 words
A process for the production of a cold-cured molded polyurethane flexible foam by reaction of a polyol with a polyisocyanate and foaming in the presence of a blowing agent followed by crushing of the molded foam to open the foam cells characterized in that foaming takes place in the presence of a mixture of (1) a predominantly linear siloxane polyoxyalkylene block copolymer having an average molecular weight in the range of about 20,000 to 250,000 and of formula (AB) n , wherein n is an integer, A is a siloxane block and B is a polyoxyalkylene block and (2) a solvent which is compatible with the high molecular weight predominantly linear siloxane polyoxyalkylene block copolymer which has a viscosity of 3 to 1,000 cps, and a surface tension between 15 and 60 dynes/cm.
Claim 2
Dependent Claim
133 words
A process for the production of a cold-cured molded polyurethane flexible foam by reaction of a polyol with a polyisocyanate and foaming in the presence of a blowing agent followed by crushing of the molded foam to open the foam cells characterized in that foaming takes place in the presence of a mixture of (1) a predominantly linear siloxane polyoxyalkylene block copolymer having an average molecular weight in the range of about 20,000 to 250,000 and of formula (AB) n , wherein n is an integer, A is a siloxane block and B is a polyoxyalkylene block and (2) a solvent which is compatible with the high molecular weight predominantly linear siloxane polyoxyalkylene block copolymer which has a viscosity of 3 to 1,000 cps, and a surface tension between 15 and 60 dynes/cm.
Claim 3
Dependent Claim
52 words
A process according to claim 1 for the production of a high resilience foam wherein at least 40% of the total polyol is constituted by a polyether triol having (a) an average primary hydroxyl content of at least 40 mole percent, and (b) an average molecular weight of from 2,000 to 8,000.
Claim 4
Dependent Claim
38 words
A process according to either claim 1 or claim 2 characterised in that the high molecular weight predominantly linear siloxane polyoxyalkylene block copolymer is employed in admixture with lower molecular weight siloxane polyoxyalkylene condensation products derived from mono-ols.
Claim 5
Dependent Claim
32 words
A process according to claim 1 wherein the predominantly linear block copolymer is made by the reaction of a polyalkyl siloxane with a mixture of a polyalkylene ether diol and a mono-ol.
Claim 6
Dependent Claim
19 words
A process according to claim 4 wherein the mono-ol is an alkoxy ether derived from a polyalkylene ether diol.
Claim 7
Dependent Claim
21 words
A process according to claim 5 wherein the weight ratio of diol to mono-ol is in the range 1:1 to 1:2.
Claim 8
Dependent Claim
31 words
A process according to claim 1 wherein the polyoxyalkylene groups in the predominantly linear block copolymer are derived from polyoxyalkylene diols having average molecular weights in the range 1500 to 7000.
Claim 9
Dependent Claim
28 words
A process according to claim 1 wherein the average molecular weight of each siloxane block in the predominantly linear block copolymer is in the range 500 to 10,000.
Claim 10
Dependent Claim
22 words
The process according to claim 1 wherein the predominantly linear high molecular weight siloxane polyoxyalkylene block copolymer is a hydrolysable block copolymer.
Claim 11
Dependent Claim
30 words
The process according to claim 1 wherein the predominantly linear high molecular weight polyoxyalkylene block copolymer is a hydrolysable block copolymer and the average molecular weight is at least 65,000.
Claim 12
Dependent Claim
31 words
The process according to claim 1 wherein the solvent which is compatible with the high molecular weight predominantly linear siloxane polyoxyalkylene block copolymer has a viscosity of 10 to 500 cps.
Claim 13
Dependent Claim
18 words
A process according to claim 1 wherein the solvent has one to six reactive OH groups per molecule.
Claim 14
Dependent Claim
18 words
The process according to claim 12 wherein the solvent has a surface tension between 30 and 40 dynes/cm.
Claim 15
Dependent Claim
14 words
The process according to claim 13 wherein the solvent is a partially alkoxylated glycol.
Claim 16
Dependent Claim
17 words
The process according to claim 15 wherein the solvent is a butoxy mono ether of ethylene glycol.
Claim 17
Dependent Claim
27 words
The process according to claim 1 wherein the weight ratio of high molecular weight predominantly linear block copolymer to solvent is in the range 2:100 to 10:100.
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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) | 1984-06-29 | 1984-12-29 | 1985-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-29 | 1988-12-29 | 1989-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-29 | 1992-12-29 | 1993-06-30 | $7700.00 | Window Closed / Lapsed |