Chemically opening chrysotile asbestos and encapsulating

Details Chemically opening chrysotile asbestos and encapsulating Chemically opening chrysotile asbestos and encapsulating

1973-01-19

1976-06-22

Smith, Ronald H.

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

162155, 427221, 427299, 427340, 427341, 428407, B32B 1700

Patent

active

039652840

ABSTRACT:
Chrysotile asbestos is chemically opened into the individual fibrils by soluble vinylic polymer polyelectrolytes containing carboxylic acid groups in aqueous media. Polyacrylic acids, polymethacrylic acids, maleic anhydride polymers and water-soluble copolymers thereof are preferred polyelectrolytes and form stable colloidal dispersions. The polyelectrolytes are neutralized to alkaline pH with inorganic or organic bases, but preferably with basic vinylic monomers when complete encapsulation is desired. By a further aspect of the invention the polyelectrolyte-coated fibrils in aqueous dispersion are encapsulated by copolymerization with (a) a basic vinylic comonomer (used for pH control) such as dimethylaminoethyl methacrylate, t-butylaminoethyl methacrylate or a vinylpyridine; and (b) a non-basic vinylic comonomer such as styrene, divinylbenzene, vinyl chloride or fluoride, vinyl acetate, methyl methacrylate, ethyl acrylate, acrylonitrile, and methacrylonitrile. The encapsulated fibrils are advantageous for forming reinforced composites including laminates and foamed or cellular products.

REFERENCES:
patent: 2609313 (1952-09-01), Fettel
patent: 2940892 (1960-01-01), Feigley et al.
patent: 3409499 (1968-11-01), Dresher et al.
patent: 3410751 (1968-11-01), Battista
patent: 3519591 (1970-07-01), Bolger
patent: 3535150 (1970-10-01), Lipsett
patent: 3582460 (1971-06-01), Lipsett
patent: 3635879 (1972-01-01), Baer et al.
patent: 3721637 (1973-03-01), Schultz et al.

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