Polymeric oxyalkylate viscosity modifiers for use in gypsum wall

Details Polymeric oxyalkylate viscosity modifiers for use in gypsum wall Polymeric oxyalkylate viscosity modifiers for use in gypsum wall

1997-07-14

1999-03-30

Chin, Peter

Adhesive bonding and miscellaneous chemical manufacture

Methods

Plaster board making

106781, 106785, B32B 1300, C04B 904

Patent

active

058883223

ABSTRACT:
Methods for making gypsum wallboard and for enhancing the compressive strength of wallboard by the addition of polymeric oxyalkylate viscosity modifiers are described. Preferred compounds are a copolymer comprising blocks of ethylene oxide and propylene oxide ether-linked to (1,2 ethandiyl dintrilo) tetrakis (propanol), an ethylene oxide/propylene oxide block copolymer and a polyethylene glycol polymer cross-linked with bisphenol A diglycidyl ether and combinations thereof.

REFERENCES:
patent: 3307987 (1967-03-01), Bieri
patent: 3389042 (1968-06-01), Bieri et al.
patent: 3592670 (1971-07-01), Kossuth et al.
patent: 4222984 (1980-09-01), Ladwig
patent: 4818506 (1989-04-01), Lin et al.
patent: 5360841 (1994-11-01), Knop et al.

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