Cast ceiling tiles containing latexes as binders

Details Cast ceiling tiles containing latexes as binders Cast ceiling tiles containing latexes as binders

1989-03-02

1991-09-10

Lilling, Herbert J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

264 69, 524427, 524446, 524447, 524451, 524456, 524533, 524559, C08K 334, C08K 326, C08L 3900

Patent

active

050474634

ABSTRACT:
Cast ceiling tile requires a particular rheology of its wet formulation for the dried tile to have a desired aesthetic appearance. The use of a latex binder rather than starch for cast ceiling tiles imparts the necessary rheological properties to the wet ceiling tile formulation. The tile is prepared by blending mineral wool with a premixture of water, latex, and filler, said premixture having a sharp yield point when measured with a recording Brookfield Viscometer. The latex is an alkali-swellable latex comprising (i) a C.sub.3 -C.sub.8 .alpha.,.beta.-ethylenically unsaturated carboxylic acid monomer in an amount from about 15 to about 60 weight percent based on the weight of the monomers in the cpolymers; (ii) at least one of a copolymerizable nonionic vinyl monomer in an amount from about 45 to about 30 weight percent based on the weight of the monomers in the copolymer and (iii) an additional late feed of nonionic vinyl monomer in an amount from about 10 to about 40 weight percent based on the weight of the monomers in the copolymer.

REFERENCES:
patent: 3955031 (1976-05-01), Jones et al.
patent: 4433022 (1984-02-01), Schwartz et al.
patent: 4861822 (1981-08-01), Keskey et al.
patent: 4863979 (1989-09-01), Beyersdorf et al.

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