Process for stiffening hats
AssigneeMantrose Haueser Company
InventorJames W. Martin
Life of this patent
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Abstract
In the manufacture of hats, the shellac stiffening agent typically used for imparting extra stiffness to the final hat product is replaced with an aqueous acrylic or acrylic/styrene emulsion or dispersion having a pH of 4 to 7, the acrylic or methacrylic polymer or copolymer in the emulsion having an acid value of 80 to 120 mg KOH/gm and a glass transition temperature of 17.degree. to 35.degree. C.
Claims14
A process for treating a body or web of fibers to promote stiffening thereof when said body or web is formed into the shape of a hat and heated during manufacture, said process comprising impregnating said body or web with an aqueous system of a synthetic stiffening polymer, said system having a pH of 4 to 7, said synthetic stiffening polymer being thermoplastic and having an acid value of 50 to 150 mg KOH/gm and a glass transition temperature of 10.degree. to 80.degree. C.
In a process for manufacturing hats in which a mat of a material selected from the group consisting of wool fibers and animal fur fibers is formed into the shape of a hat and heated to cause said mat to remain in said shape, the improvement comprising impregnating said mat with a synthetic polymer stiffening system, said system comprising an aqueous emulsion or dispersion of a thermoplastic synthetic polymer having an acid value of 50 to 150 mg KOH/gm and a glass transition temperature of 10.degree. to 80.degree. C., said aqueous emulsion or dispersion also having a pH of 4 to 7.
A process for forming a hat comprising
- (a) impregnating a fibrous felt body with an aqueous emulsion or dispersion of a synthetic stiffening polymer, said aqueous emulsion or dispersion having a pH of 4 to 7, said synthetic stiffening polymer being thermoplastic and having an acid value of 50 to 150 mg KOH/gm and a glass transition temperature of 10.degree. to 80.degree. C.,
- (b) forming the impregnated fibrous body so made into the shape of a hat, and
- (c) subjecting said impregnated fibrous body to a first heating step for causing said fibrous body to stiffen.
A process for treating a body or web of fibers to promote stiffening thereof when said body or web is formed into the shape of a hat and heated during manufacture, said process comprising impregnating said body or web with an aqueous system of a synthetic stiffening polymer, said system having a pH of 4 to 7, said synthetic stiffening polymer being thermoplastic and having a glass transition temperature of 10.degree. to 80.degree. C. and a precipitation index of 2-10.
Dependencies are inferred from the claim text.