Dispersant for filled, rigid cellular polymers
AssigneeThe Celotex Corporation
InventorsJudy A. Godbey, Jyothi S. Pisipati
Life of this patent
Estimating the term…
Abstract
A process for the manufacture of a closed cell, rigid, polymer foam from polymer foam-forming ingredients containing a filler which comprises: (a) dispersing the filler in at least a portion of the foam-forming ingredients to form a filled dispersion, a fluorochemical surfactant being incorporated in the foam-forming ingredients either before, during or after the dispersing operation to form a dispersion containing a filler and a fluorochemical surfactant, (b) mixing the dispersion formed in step (a) with any remaining foam-forming ingredient or ingredients, and (c) foaming and curing the resultant foam-forming composition. The fluorochemical surfactant improves the stability, flowability and mixing of the dispersion during the foam production.
Claims17
A process for the manufacture of a closed cell, rigid, polymer foam from polymer foam-forming ingredients containing a filler which comprises:
- (a) dispersing the filler in at least a portion of the foam-forming ingredients to form a filled dispersion, a non-ionic fluorochemical surfactant being incorporated in the foam-forming ingredients either before, during or after the dispersing operation to form a dispersion containing a filler and a fluorochemical surfactant,
- (b) mixing the dispersion formed in step (a) with any remaining foam-forming ingredient or ingredients, and
- (c) foaming and curing the resultant foam-forming composition, wherein the non-ionic fluorochemical surfactant has the formula of R.sub.f --X wherein R.sub.f is a fluorocarbon group and X is a group which makes the surfactant soluble in the foam-forming ingredients.
Dependencies are inferred from the claim text.