Alkyl aryl ethyleneoxy sulfonate surfactants for vinyl acetate polymerization
AssigneeGAF Corporation
InventorsParitosh M. Chakrabarti, Darrell G. Kirchner
Life of this patent
Estimating the term…
Abstract
Improved surfactants can be produced from alkyl aryl poly(ethyleneoxy) sulfonates, represented by the formula: ##STR1## wherein: R is an alkyl or dialkyl group having at least 6 carbon atoms; and n is greater than 9; and Me is a monovalent cation, preferably Na, NH.sub.4, K or Li. High solids content aqueous vinyl acetate emulsions having long term stability are provided by polymerizing vinyl acetate in the presence of the surfactant and water. The quantity of water is predetermined so as to produce a latex having at least 40% solids.
Claims8
The method of producing aqueous polymer emulsions comprising:
- contacting a mixture of water, vinyl acetate monomer and at least about 0.1 percent by weight of the vinyl acetate monomer of a surfactant having the formula:
- ##STR12## wherein:
- R.sub.1 is an alkyl group having from 6 to 18 carbons;
- R.sub.2 is H or an alkyl group having from 6 to 12 carbons;
- n is greater than 9;
- and
- Me is a monovalent cation selected from the group consisting of NH.sub.4, Na, Li and K,
- the weight ratio of water to vinyl acetate being predetermined such that the resultant emulsion contains at least 40% by weight of solids.
A stable aqueous emulsion of a vinyl acetate polymer produced by polymerizing a monomer charge comprising:
- (a) water;
- (b) vinyl acetate monomer;
- and
- (c) at least about 0.1 percent by weight based on the weight of the vinyl acetate monomer, of a surfactant having the formula:
- ##STR13## wherein:
- R.sub.1 is an alkyl group having from 6 to 18 carbons;
- R.sub.2 is H or an alkyl group having from 6 to 12 carbons;
- n is greater than 9;
- and
- Me is a monovalent cation selected from the group consisting of NH.sub.4, Na, Li and K,
- said water comprising less than about 60% by weight of the emulsion.
Dependencies are inferred from the claim text.