Patent US3862912A successfully refreshed from Google Patents.
US3862912A
Expired / Lapsed
US
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Process for producing medium-to coarse-cell rigid phenolic resin foams of improved abrasion wear
Assignee: Wintershall Dea International AG
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Filing: 1974-05-31
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Granted: 1975-01-28
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Expires: 1994-05-31
Abstract
Abstract Disclosed is a process for producing medium to coarse cell rigid phenolic resin foams having improved abrasion wear by adding to a mixture of phenol-formaldehyde resin, hardening and foaming agent, prior to foaming an additive dispersion consisting of a copolymer of fumaric acid diesters and of a vinyl aromatic compound such as styrene and optionally an olefin such as propylene.
Inventors
- 👤 Heinz Berndt
- 👤 Dragomir Simic
- 👤 Heinz-Ulrich Zupancic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:30
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08L; C08L61/00; C08L61/04; C08L61/06; C08J2361/00; C08J2361/04; C08J2361/06; C08J2361/08; C08J2361/10; C08J2457/00; C08L35/00; C08L35/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
33 words
The process of claim 1 wherein said additive is a copolymer of fumaric acid diesters with at least one aromatic compound and at least one olefin having from 2 to 8 carbon atoms.
Claim 2
Dependent Claim
44 words
The process of claim 1 wherein the phenolformaldehyde resin solution has a phenol to formaldehyde mole ratio of about 1:1.1 to about 1 to 3, a viscosity of about 1500 to 4000 cps and a solids content ranging from about 70 to 80 percent.
Claim 3
Dependent Claim
28 words
The process according to claim 1, wherein said additive contains from 10 to 20 percent of dispersed solids based on the solids content of the phenolic resin solution.
Claim 4
Dependent Claim
28 words
The process according to claim 1, wherein said additive consists of an aqueous dispersion of a copolymer obtained from fumaric acid diisopropylester, fumaric acid di-n-butylester, styrene, and propylene.
Claim 5
Dependent Claim
110 words
A rigid phenol-formal-dehyde resin foam of medium to coarse cellular structure and improved abrasion wear comprising 5 to 30% by weight based on the phenol-formaldehyde resin of a copolymerized mixture of: a. from 50 to 90 parts by weight of fumaric acid diesters of tertiary and/or secondary aliphatic alcohols having from 3 to 6 carbon atoms, b. zero to 10 parts by weight of a monoolefin having from 2 to 8 carbon atoms, c. from 3 to 25 parts by weight of a vinyl aromatic monomer, d. from 5 to 20 parts by weight of fumaric acid diester of a primary aliphatic alcohol having from 4 to 8 carbon atoms.
References Cited (Backward Citations)
US2933461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |