Hydrophilic polymer compositions for injection molding
First Claim
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1. A molded hydrophilic gelatin-water containing shaped article of manufacture wherein the water content is in the range of from about 5% to about 25% by weight of the hydrophilic gelatin, said shaped article being formed directly:
- (a) from a hydrophilic gelatin-water solution at temperatures in the range of from 50°
C. to about 190°
C. and elevated pressures, wherein the water content was maintained in the range of about 5 to 25% by weight of the hydrophilic gelatin;
(b) by reducing the temperature of said hydrophilic gelatin-water solution during molding to below the glass transition temperature of said hydrophilic gelatin;
whereby said molded article exhibits a self sustaining shape and negligible reversible elastic deformation of the hydrophilic gelatin.
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Abstract
A moldable hydrophilic polymer composition, preferably gelatin, for use in an injection molding device preferably controlled with a microprocessor. The composition has a molecular mass range of 10,000 to 2,000,000 Dalton or a molecular mass range of 10,000 to 2,000,000 and 10,000,000 to 20,000,000 Dalton. The composition has a water content range from 5 to 25% percent by weight.
103 Citations
17 Claims
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1. A molded hydrophilic gelatin-water containing shaped article of manufacture wherein the water content is in the range of from about 5% to about 25% by weight of the hydrophilic gelatin, said shaped article being formed directly:
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(a) from a hydrophilic gelatin-water solution at temperatures in the range of from 50°
C. to about 190°
C. and elevated pressures, wherein the water content was maintained in the range of about 5 to 25% by weight of the hydrophilic gelatin;(b) by reducing the temperature of said hydrophilic gelatin-water solution during molding to below the glass transition temperature of said hydrophilic gelatin;
whereby said molded article exhibits a self sustaining shape and negligible reversible elastic deformation of the hydrophilic gelatin. - View Dependent Claims (3, 4, 5, 6, 8, 9, 10, 11, 12)
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- 2. A capsule capable of being self sustaining, having as its basic structural component a material which is in the form of a hydrophilic gelatin having its microstructure defined by said gelatin having been subjected to temperatures beyond its glass transition point and its melting point prior to shaping by injection molding.
- 13. An injection molded hydrophilic gelatin water containing shaped article of manufacture wherein said article as ejected from the mold has a water content in the range of from about 5% to about 25% by weight of the hydrophilic gelatin and exhibits an essentially amorphous gelatin structure.
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17. A hydrophilic gelatin-water composition having no phase separation of the water from the hydrophilic gelatin water mixture at a water content of between about 5 and 25% by weight of the hydrophilic gelatin, said mixture being obtained by:
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(a) mixing the gelatin with water in a predetermined amount between about 5 and 25% by weight of the hydrophilic gelatin; (b) heating the hydrophilic gelatin with said water while maintaining said predetermined water content to form a melt; (c) further heating the hydrophilic gelatin and water above its glass transition temperature and above its melting point to dissolve the melt in the water and achieve a melt as a molecularly dispersed solution.
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Specification