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US 5,328,952 AGranted
Multi-stage polymer latex cement modifier and process of making
AssigneeRohm and Haas Company
InventorsJohn G. Brodnyan, Shang-Jaw Chiou, Mark P. de Grandpre
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Abstract
Multi-stage polymer process and composition having an alkali-insoluble emulsion polymer and an alkali-soluble polymer are produced by a two-stage sequential emulsion polymerization process. When the multi-stage polymers of this invention are utilized as cement modifiers, improvements in cement mortar physical properties are realized.
Claims10
A multi-stage polymer composition produced by a two-stage sequential aqueous emulsion polymerization method comprising:
- a) forming in a first stage a mixture of monomers comprising from about 90 to about 100 percent of an alkyl acrylate or methacrylate and from about 0 to 10 percent of a carboxylic acid,
- b) polymerizing the mixture to form the insoluble polymer,
- c) forming in a second stage a mixture of monomers comprising from about 40 to 80 percent of an alkyl acrylate or methacrylate and from about 5 to 60 percent of a carboxylic acid and from about 5 to 60 percent of a hydroxyalkyl ester of a carboxylic acid,
- d) adding the second-stage monomers mixture to the polymerized first stage monomers, and
- e) polymerizing the second stage monomers to form a soluble polymer wherein the weight ratio of the insoluble polymer is from about 90-99 and the weight ratio of the soluble polymer is from about 1-10 as a percentage of the final polymer.
2 more elements
Dependencies are inferred from the claim text.