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US4151336A Expired / Lapsed US ⏱️ 0.0 years remaining

Process for the production of a substantially equimolecular copolymer of maleic acid anhydride and diisobutylene

Assignee: Bayer AG
•
Filing: 1978-01-13
•
Granted: 1979-04-24
•
Expires: 1998-01-13
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Abstract

Abstract An improved process for the production of a substantially equimolecular copolymer of maleic acid anhydride and diisobutylene in which from 10 to 100 mole % of the anhydride groups are esterified with linear or branched aliphatic monoalcohols containing from 1 to 20 carbon atoms or with cycloaliphatic monoalcohols containing from 5 to 6 carbon atoms to form the corresponding semiesters, wherein shortly before or after the end of the solution or suspension copolymerization of maleic acid anhydride and diisobutylene a monomer corresponding to the general formula ##STR1## in which R=H, CH 3 , C 2 H 5 , --OR 2 , --O--CO--CH 3 , ##STR2## --CH 2 OH, --CH 2 O--C--CH 3 , R 1 =H , CH 3 and R 2 =a linear or branched alkyl group containing from 1 to 4 carbon atoms, Or mixtures of these monomers with one another are added to the polymerization mixture in quantities of from 1 to 12 mole %, based on the maleic acid anhydride used. The aqueous or aqueous-alcoholic alkali, amine or ammonium salt solutions of the semiesters of the copolymer are highly effective as anionic sizing agents for paper.

Inventors

  • 👤 Gunter Sackmann
  • 👤 Gunter Kolb
  • 👤 Heinz Fischer
  • 👤 Friedhelm Muller

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 05:21
CPC Classifications
C; C08; C08F; C08F222/00; C08F222/04; C08F222/06; C08F210/00; C08F210/14; D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/41; D21H17/42; D21H17/43

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 165 words
A process for producing a substantially equimolecular copolymer of maleic acid anhydride and diisobutylene which comprises the steps of initiating solution or suspension copolymerization of maleic acid anhydride and diisobutylene and shortly before or after conclusion of said copolymerization introducing at least one additional monomer into the resulting polymerization mixture in an amount of from 1 to 12 mol %, based on the amount of maleic acid anhydride subjected to copolymerization, and maintaining resulting monomer containing polymerization mixture at a temperature of from 30° to 200° C. in the presence of a free radical initiator until the unreacted maleic acid anhydride content of said mixture has been reduced, said at least one monomer being of the formula ##STR9## wherein R is hydrogen, --CH 3 , --C 2 H 5 , --OR 2 , --O--CO--CH 3 , ##STR10## --CH 2 OH or --CH 2 O--CO--CH 3 ; R 1 is hydrogen or --CH 3 and R 2 is alkyl having from 1 to 4 carbon atoms.
Claim 2
Dependent Claim 165 words
A process for producing a substantially equimolecular copolymer of maleic acid anhydride and diisobutylene which comprises the steps of initiating solution or suspension copolymerization of maleic acid anhydride and diisobutylene and shortly before or after conclusion of said copolymerization introducing at least one additional monomer into the resulting polymerization mixture in an amount of from 1 to 12 mol %, based on the amount of maleic acid anhydride subjected to copolymerization, and maintaining resulting monomer containing polymerization mixture at a temperature of from 30° to 200° C. in the presence of a free radical initiator until the unreacted maleic acid anhydride content of said mixture has been reduced, said at least one monomer being of the formula ##STR9## wherein R is hydrogen, --CH 3 , --C 2 H 5 , --OR 2 , --O--CO--CH 3 , ##STR10## --CH 2 OH or --CH 2 O--CO--CH 3 ; R 1 is hydrogen or --CH 3 and R 2 is alkyl having from 1 to 4 carbon atoms.
Claim 3
Dependent Claim 33 words
A process as claimed in claim 1, wherein the additional monomer is isobutylene, allyl alcohol, methallyl alcohol, styrene, α-methyl styrene, p-methyl styrene, vinylacetate, allyl acetate or isobutyl vinyl ether or a mixture thereof.
Claim 4
Dependent Claim 23 words
A process as claimed in claim 1, wherein the additional monomer is introduced at a temperature of from 30° C. to 200° C.
Claim 5
Dependent Claim 18 words
A process as claimed in claim 1, wherein the additional monomer is introduced together with a radical-forming substance.
Claim 6
Dependent Claim 23 words
A process as claimed in claim 1, wherein the additional monomer is introduced in a quantity of from 5 to 10 mole %.
Claim 7
Dependent Claim 60 words
A process as claimed in claim 1 wherein 10 to 100 mol % of the anhydride groups of said substantially equimolecular copolymer of maleic acid anhydride and diisobutylene is esterified with at least one aliphatic monoalcohol having from 1 to 20 carbon atoms or at least one cycloaliphatic monoalcohol having 5 to 6 carbon atoms to form the corresponding semiester.

References Cited (Backward Citations)

US2725367A Cited
US2930775A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1982-04-23 1982-10-23 1983-04-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1986-04-23 1986-10-23 1987-04-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1990-04-23 1990-10-23 1991-04-24 $7700.00 Window Closed / Lapsed

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