Polymers containing heat labile components adsorbed on polymeric carriers and methods for their preparation
OwnerFrank M. Fosco, JR., Edward E. Sowersinventors
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Abstract
Compositions containing polymers and one or more heat labile and/or incompatible components adsorbed on carrier materials are provided. The heat labile components include materials that are inactivated, that volatilize, decompose, or undergo a chemical reaction or transformation at the polymer's processing temperatures (heat labile biocides). Incompatible components are materials that generally react or form gels or precipitates upon mixing. The carrier materials generally include inorganic or organic porous materials capable of remaining solid during processing temperatures. Methods for preparing the polymer compositions are provided.
Claims29
A composition comprising a polymer having a continuous solid phase, and a heat labile component/carrier combination, wherein:
- (a) the polymer has a melting temperature;
- (b) the heat labile component has a transformation temperature;
- (c) the polymer's melting temperature is greater than the heat labile component's transformation temperature;
- (d) the heat labile component/carrier combination is distributed throughout the polymer's continuous solid phase;
- and
- (e) the continuous solid phase exhibits at least one property derived from the heat labile component.
A method for preparing a composition comprising:
- (a) providing a polymer and a heat labile component/carrier combination, wherein the polymer has a melting temperature and the heat labile component has a transformation temperature;
- (b) subjecting the polymer to a processing temperature for a time sufficient to form a melt;
- (c) distributing the heat labile component/carrier combination within the melt;
- and
- (d) cooling the melt to form a continuous solid phase containing the heat labile component, with substantially no transformation of the heat labile component;
- wherein the processing temperature is ≧the polymer's melting temperature and the heat labile component's transformation temperature.
A composition comprising at least one encapsulated form of a heat labile component/carrier combination suitable for inclusion into a molten polymer without transformation of the at least one heat labile component.
Dependencies are inferred from the claim text.