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 Polymeric materials with acid end groups

Details
Inventors: Jones, Frank N.;
Assignee: E. I. Du Pont de Nemours and Company (Wilmington, DE)
Primary Examiner: Gotts; Lewis
Assistant Examiner: Whittenbaugh; Robert C.
Attorney, Agent or Firm:

Polymeric materials represented by the general structure ##STR1## WHERE Q is a polymeric segment of ethylenically unsaturated monomers, lacking Zerewitinoff hydrogen atoms; X is the residue of a chain transfer agent; Y is the residue of a di-, tri- or tetraisocyanate radical after removal of isocyanate groups; A is the residue of an acid radical having a pk.sub.a value of -1 to 6; and m and n are 1, 2 or 3, (the total not exceeding 4), Are useful as aids for dispersing solid particles in organic liquids.

DETAILED DESCRIPTION I claim: 1.
A polymeric material represented by the structure ##STR17## where Q is a non-resinous polymeric or copolymeric segment of a.
an ester of acrylic acid or methacrylic acid with an alkanol of 1-18 carbon atoms; b.
styrene or acrylonitrile; c.
a vinyl ester derived from an acid of 2 through 18 carbon atoms; or d.
a vinyl ether; X is the residue of a chain transfer agent; Y is the residue of a di-, tri-, or tetraisocyanate radical after removal of isocyanate groups; A is the residue of an acid radical having a pk.
sub.
a value of -1 to 6; and m and n are 1, 2 or 3, the total not exceeding 4, provided that when n is 2 or 3, only one of A need be as defined.
2.
The polymeric material of claim 1 wherein Q is a polymeric segment one of whose monomer units is methyl methacrylate.
3.
The polymeric material of claim 1 wherein Q is a polymeric segment of methyl methacrylate and an ester of acrylic acid or methacrylic acid with an alkanol of 2-12 carbon atoms.
4.
The polymeric material of claim 1 wherein Q is a methyl methacrylate /2-ethylhexyl acrylate polymeric segment.
5.
The polymeric material of claim 1 wherein X is --S-R-Z where R is alkylene of 1-6 carbon atoms and ##STR18## 6.
The polymeric material of claim 1 wherein Y is ##STR19## 7.
The polymeric material of claim 1 wherein A is a mercapto-, hydroxy- or carboxy substituted carboxylic acid radical.
8.
The polymeric material of claim 2 wherein the acid radical is ##STR20## 9.
A polymeric material represented by the structure ##STR21## where Q is a non-resinous methyl methacrylate /2-ethylhexyl acrylate polymeric segment.
10.
A polymeric material represented by the structure ##STR22## where Q is a non-resinous lauryl methacrylate/ethyl acrylate/methyl methacrylate polymer segment.
11.
The polymeric material of claim 1 wherein Q is a polymeric segment one of whose monomer units is methyl methyacrylate.
12.
The polymeric material of claim 1 wherein Q is a polymeric segment of methyl methacrylate and an ester of acrylic acid or methacrylic acid with an alkanol of 2-12 carbon atoms


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