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US4139685A Expired / Lapsed US ⏱️ 0.0 years remaining

Method for the preparation of polyacrylimide and polymethacrylimide foams

Assignee: Roehm GmbH Darmstadt
•
Filing: 1978-05-31
•
Granted: 1979-02-13
•
Expires: 1998-05-31
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Abstract

Abstract What is disclosed is a method of making a foamed polyacrylimide or polymethacrylimide polymer which comprises free-radically polymerizing a mixture comprising (A) a member selected from a first group consisting of acrylonitrile and methacrylonitrile and a member selected from a second group consisting of acrylic acid and methacrylic acid, the mol ratio of the members of said first group to the members of said second group being between 2:3 and 3:2, and (B) up to 20 percent, by weight of (A), of other free radically-polymerizable monomers copolymerizable therewith, Said mixture further comprising from 1 to 15 percent, by weight of (A) and (B), of a foaming agent which is a monovalent aliphatic alcohol having 3 to 8 carbon atoms, to form a solid polymer, and then heating said polymer at a temperature from 170° C. to 250° C. until a foam is formed.

Inventors

  • 👤 Guenter Schroeder

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 04:56
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/142; C08J5/00; C08J5/12; C08J2333/00; C08J2333/24; C08J2333/26; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249991; Y10T428/249992

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 139 words
The method of making a foamed polyacrylimide or polymethacrylimide polymer which comprises free-radically polymerizing a mixture comprising (A) a member selected from a first group consisting of acrylonitrile and methacrylonitrile and a member selected from a second group consisting of acrylic acid and methacrylic acid, the mol ratio of the members of said first group to the members of said second group being between 2:3 and 3:2, and (B) up to 20 percent, by weight of (A), of other free radically-polymerizable monomers copolymerizable therewith, said mixture further comprising from 1 to 15 percent, by weight of (A) and (B), of a foaming agent which is a monovalent aliphatic alcohol having 3 to 8 carbon atoms, to form a solid polymer, and then heating said polymer at a temperature from 170° C. to 250° C. until a foam is formed.
Claim 2
Independent Claim 139 words
The method of making a foamed polyacrylimide or polymethacrylimide polymer which comprises free-radically polymerizing a mixture comprising (A) a member selected from a first group consisting of acrylonitrile and methacrylonitrile and a member selected from a second group consisting of acrylic acid and methacrylic acid, the mol ratio of the members of said first group to the members of said second group being between 2:3 and 3:2, and (B) up to 20 percent, by weight of (A), of other free radically-polymerizable monomers copolymerizable therewith, said mixture further comprising from 1 to 15 percent, by weight of (A) and (B), of a foaming agent which is a monovalent aliphatic alcohol having 3 to 8 carbon atoms, to form a solid polymer, and then heating said polymer at a temperature from 170° C. to 250° C. until a foam is formed.
Claim 3
Dependent Claim 16 words
A method as in claim 1 wherein said aliphatic alcohol is a secondary or tertiary alcohol.
Claim 4
Dependent Claim 13 words
A method as in claim 2 wherein said aliphatic alcohol is tert.-butyl alcohol.
Claim 5
Dependent Claim 28 words
A method as in claim 1 wherein said mixture additionally comprises from 0.1 to 3 percent of water, by weight of the total weight of the reaction mixture.
Claim 6
Dependent Claim 14 words
A method as in claim 1 wherein (A) consists of methacrylonitrile and methacrylic acid.

References Cited (Backward Citations)

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GB1078425A Cited
US3489700A Cited
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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) 1982-02-12 1982-08-14 1983-02-13 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1986-02-12 1986-08-14 1987-02-13 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1990-02-12 1990-08-14 1991-02-13 $7700.00 Window Closed / Lapsed

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