Hydrogels containing substances
AssigneeThe B. F. Goodrich Company
InventorsDean M. Frate, Joseph A. Chiarelli, Yong Ma
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Abstract
A blend of one or more crosslinked polymers or copolymers prepared from an olefinically unsaturated polymerizable carboxylic or anhydride monomer and at least one high molecular weight essentially linear polymer prepared from an olefinically unsaturated polymerizable carboxylic acid monomer. The blend is neutralized to typically a low pH, and generally contains a noncovalent, e.g. ionic, crosslinking agent, and a cure rate modifier. The hydrogel blend is capable of containing a large amount of water, has good tack, good adhesion, and can be utilized as an application vehicle having a backing thereon as well as containing various substances such as personal care compounds, pharmaceuticals, active ingredients, and the like.
Claims20
An aqueous polymeric composition, comprising:
- a blend of at least one crosslinked polymer and at least one high molecular weight substantially linear carboxylic acid-based polymer.
- said crosslinked polymer derived from
- (a) a polymer made from at least one olefinically unsaturated carboxylic acid or anhydride monomer, or
- (b) a copolymer of said at least one olefinically unsaturated carboxylic acid or anhydride monomer and a comonomer, or
- (c) an interpolymer of said (a) or said (b), or combinations thereof,
- with the proviso that when said crosslinked polymer is said (b) copolymer or said (c) interpolymer of said (b), the amount of comonomer forming said copolymer is from about 0.001 to about 30 percent by weight of said copolymer;
- and
- said at least one high molecular weight substantially linear carboxylic acid-based polymer derived from at least one olefinically unsaturated carboxylic acid monomer, said crosslinked polymer being crosslinked by a crosslinking agent, and said high molecular weight substantially linear carboxylic acid-based polymer having a weight average molecular weight of at least 200,000.
An aqueous polymeric gel composition comprising:
- an aqueous blend of:
- at least one crosslinked polymer and at least one high molecular weight substantially linear carboxylic acid-based polymer,
- said crosslinked polymer derived from
- (a) a polymer made from at least one olefinically unsaturated carboxylic acid or anhydride monomer, or
- (b) a copolymer of said at least one olefinically unsaturated carboxylic acid or anhydride monomer and a comonomer, or
- (c) an interpolymer of said (a) or said (b), or combinations thereof,
- with the proviso that when said crosslinked polymer is said (b) copolymer or said (c) interpolymer of said (b), the amount of comonomer forming said copolymer is from about 0.001 to about 30 percent by weight of said copolymer;
- and
- said at least one high molecular weight substantially linear carboxylic acid-based polymer derived from at least one olefinically unsaturated carboxylic acid monomer, said crosslinked polymer being crosslinked by a crosslinking agent, and said high molecular weight substantially linear carboxylic acid-based polymer having a weight average molecular weight from about 200,000 to about 2,000,000.
Dependencies are inferred from the claim text.