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US3666720A Expired / Lapsed US ⏱️ 0.0 years remaining

Vinyl chloride copolymers

Assignee: Imperial Chemical Industries Ltd
•
Filing: 1970-08-11
•
Granted: 1972-05-30
•
Expires: 1990-08-11
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Abstract

Abstract Improved thermoplastic materials are provided which are polymeric products comprising from 99 to 1 percent by weight of vinyl chloride units, from 1 to 90 percent by weight of N-aryl maleimide units and from 0 to 49 percent by weight of units derived from at least one other copolymerisable ethylenically unsaturated compound. Very interesting materials are obtained when the said compound comprises not more than 20 percent by weight of the polymeric product. The preferred products contain from 60 to 99 percent by weight of vinyl chloride residues, from 1 to 40 percent by weight of N-aryl maleimide residues and 0 to 20 percent by weight of residues derived from the other monoethylenically unsaturated compound.

Inventors

  • 👤 Eric Nield
  • 👤 John Brewster Rose

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 20:47
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/02; C08F214/04; C08F214/06; C08F22/00; C08F22/36

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 59 words
A solid polymeric product as claimed in claim 1, characterized in that said polymeric product comprises from 90 to 70 percent by weight of vinyl chloride units, 10 to 30 percent by weight of said N-aryl maleimide units and from 0 to 20 percent by weight of units of said other ethylenically unsaturated compound, the percentages totalling 100 percent.
Claim 2
Dependent Claim 40 words
A solid polymeric product as claimed in claim 1, characterized in that said ethylenically unsaturated compound is one whose homopolymer has a softening point at least as high as that of a homopolymer of vinyl chloride of comparable molecular weight.
Claim 3
Dependent Claim 20 words
A solid polymeric product as claimed in claim 1, characterized in that the N-aryl maleimide is an N-(2-substituted phenyl) maleimide.
Claim 4
Dependent Claim 29 words
A solid polymeric product as claimed in claim 1, characterized in that the N-aryl maleimide is a chloro- or bromo-substituted N-phenyl maleimide or is N-o-tolyl maleimide or N-m-methoxyphenyl maleimide.
Claim 5
Dependent Claim 50 words
A solid polymeric product of vinyl chloride and a N-substituted maleimide which consists essentially of from 99 to 1 percent by weight of vinyl chloride units and from 1 to 99 percent by weight of units of N-phenyl maleimide, N-o-chlorophenyl maleimide, N-o-tolyl maleimide, N-m-methoxyphenyl maleimide or N- Alpha -naphthyl maleimide.
Claim 6
Dependent Claim 36 words
A solid polymeric product as claimed in claim 1, characterized in that said polymeric product is a copolymer of (i) vinyl chloride, (ii) N-phenyl maleimide and (iii) styrene, acrylonitrile, Alpha -methyl-styrene, vinyl ethyl ether or butadiene.

References Cited (Backward Citations)

US2342295A Cited
US2384239A Cited
US2403960A Cited
US2650215A Cited
US2743260A Cited
US3352832A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-05-30 1975-11-29 1976-05-30 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-05-30 1979-11-29 1980-05-30 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-05-30 1983-11-29 1984-05-30 $7700.00 Window Closed / Lapsed

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