Patent US4111861A successfully refreshed from Google Patents.
US4111861A
Expired / Lapsed
US
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Method of molding polyurethanes having mold release properties
Assignee: Lyondell Chemical Technology LP
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Filing: 1976-09-24
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Granted: 1978-09-05
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Expires: 1996-09-24
Abstract
Abstract This invention relates to compositions and methods for forming polyether polyurethanes utilizing internal release additives for the purpose of facilitating mold release in the production of molded objects. The invention discloses four classes of internal release additives: (1) mixtures of aliphatic or aryl carboxylic acid and a polar metal compound; (2) carboxyalkylsiloxanes; (3) aliphatic glyoximes; and (4) aralkyl quaternary ammonium salts.
Inventors
- 👤 Robert Everett Godlewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:48
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/32; C08K5/33; C08K3/00; C08K3/18; C08K3/24; C08K3/26; C08K5/04; C08K5/09; C08K5/17; C08K5/54; C08K5/541; C08K5/5415; C08K5/5419; C08L; C08L75/00; C08L75/04; C08L75/08; C08L83/00; C08L83/04; Y; Y10; Y10S; Y10S264/00; Y10S264/83; Y10S521/00; Y10S521/904
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
104 words
A method for producing a polyurethane elastomer which comprises forming in a mold cavity having metal walls and curing a reaction mixture containing: (a) a polyol, (b) an organic polyisocyanate in an amount that provides from 0.8 to 1.3 isocyanato groups per active-hydrogen in the reaction mixture, (c) a catalytic amount of catalyst for curing of the reaction mixture to produce the elastomer, and (d) as a mold release additive, mixtures of a fatty acid wherein the number of carbon atoms ranges from about 8 to about 35 and a compound selected from the group consisting of sodium carbonate, sodium oleate and potassium laurate.
Claim 2
Independent Claim
104 words
A method for producing a polyurethane elastomer which comprises forming in a mold cavity having metal walls and curing a reaction mixture containing: (a) a polyol, (b) an organic polyisocyanate in an amount that provides from 0.8 to 1.3 isocyanato groups per active-hydrogen in the reaction mixture, (c) a catalytic amount of catalyst for curing of the reaction mixture to produce the elastomer, and (d) as a mold release additive, mixtures of a fatty acid wherein the number of carbon atoms ranges from about 8 to about 35 and a compound selected from the group consisting of sodium carbonate, sodium oleate and potassium laurate.
Claim 3
Dependent Claim
12 words
A method as claimed in claim 1 for molding a non-cellular polyurethane.
Claim 4
Dependent Claim
10 words
A non-cellular elastomer produced by the process of claim 2.
Claim 5
Dependent Claim
34 words
A method as claimed in claim 1 for producing a microcellular polyurethane elastomer wherein there is also employed: (a) a blowing agent in an amount sufficient to produce a microcellular structure in the elastomer.
Claim 6
Dependent Claim
10 words
A microcellular elastomer produced by the process of claim 4.
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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) | 1981-09-04 | 1982-03-06 | 1982-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-04 | 1986-03-06 | 1986-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-04 | 1990-03-06 | 1990-09-05 | $7700.00 | Window Closed / Lapsed |