Claims
- 1. A cohesive polymer matrix comprising a matrix polymer and a coating particulate filler dispersed therein, characterized in that the matrix polymer is an acrylic polymer, and the filler is coated at least in part with a composition comprising an organic coating polymer of number average molecular weight in the range 500-15,000, which contains an unsaturated group present as part of a structure which is the product of polymerizing one or more dienes and an acidic group for precursor thereof and in that the unsaturated group is either bonded or non-bonded to the matrix acrylic polymer.
- 2. A matrix according to claim 1, characterized in that the acrylic matrix polymer is essentially a homopolymer or a copolymer of acrylic monomer species.
- 3. A matrix according to claim 1, characterized in that the matrix polymer is a cross-linked methyl methacrylate-glycol dimethacrylate copolymer.
- 4. A matrix according to claim 1, characterized in that it comprises 25 to 98% matrix polymer, 1.5 to 75% to 75% filler and 0.1 to 15% coating polymer.
- 5. A matrix according to claim 1, characterized in that the coating polymer comprises at least 5 weight % of the unsaturated binding groups.
- 6. A matrix according to claim 1, characterized in that the coating polymer is a substituted polybutadiene.
- 7. A matrix according to claim 1, characterized in that the coating polymer comprises an .alpha.,.beta.-dicarboxylic cyclic anhydride group or the product of the reaction of the same with the filler surface.
- 8. A precursor composition for a matrix according to claim 1, characterized in that it comprises a dispersion of a coating composition as defined in claim 1 in a matrix of an acrylic monomer.
- 9. A process for the production of a filled cohesive acrylic polymer matrix according to claim 1 which process comprises intimately mixing a matrix acrylic polymer or a precursor thereof with
- (a) a filler and a coating composition or precursor thereof as defined in claim 1, or
- (b) a filler coated with a coating composition or precursor thereof, and thereafter as necessary converting any acrylic polymer precursor in the mixture to an acrylic polymer matrix.
- 10. A cohesive polymer matrix as claimed in claim 1 wherein the matrix is a precursor composition comprising an oligomeric precursor and a monomeric precursor of the acrylic polymer.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8713693 |
Jun 1987 |
GB3 |
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Parent Case Info
This is a continuation of application U.S. Ser. No. 07/205,752, filed June 13, 1988, which was abandoned upon the filing thereof.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4251576 |
Osborn et al. |
Feb 1981 |
|
4695503 |
Liu et al. |
Sep 1987 |
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Continuations (1)
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Number |
Date |
Country |
Parent |
205752 |
Jun 1988 |
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