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US 5,527,846 AGranted
Polychloroprene adhesive latex composition
AssigneeE. I. Du Pont de Nemours and Company
InventorsLance A. Christell, Richard M. Tabibian
Life of this patent
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Abstract
Polychloroprene latex adhesive compositions which comprise a) mercaptan-modified or xanthogen disulfide-modified 2-chloro-1,3-butadiene homopolymers having gel contents of 5-70 percent by weight, b) 1 to 75 parts by weight of rosin per 100 parts by weight of a), and c) sufficient water to provide a solids content of 25-65 weight percent based on the weight of component a) exhibit excellent heat resistance and green bond strength.
Claims11
An aqueous latex adhesive composition which comprises
- a) a mercaptan-modified or xanthogen disulfide-modified 2-chloro-1,3-butadiene crystalline homopolymer having a gel content of 5-70 percent by weight;
- b) 1 to 75 parts by weight of rosin per 100 parts by weight of a);
- and
- c) a sufficient amount of water to provide a composition having a solids content of 25-65 weight percent based on the weight of component a) with the proviso that the mercaptan-modified or xanthogen disulfide-modified 2-chloro-1,3-butadiene homopolymer is prepared by free radical emulsion polymerization of 2-chloro-1,3-butadiene at a temperature of 5.degree. C.-20.degree. C., to a conversion of 70-95%, and the amount of mercaptan or xanthogen disulfide modifier present during polymerization is within the range of 1.5.times.10.sup.-4 -2.5.times.10.sup.-4 moles per mole of 2-chloro-1,3-butadiene.
1 more element
Dependencies are inferred from the claim text.