Method of making an expanded material and the product resulting therefrom

• US 2,653,917 A
• Filed: 06/15/1950
• Issued: 09/29/1953
• Est. Priority Date: 06/15/1950
• Status: Expired due to Term

• Current Assignee: George Hammon Henry
• Original Assignee: George Hammon Henry
• Inventors: GEORGE HAMMON HENRY
• Application Number:
  US03/168,380
• Time in Patent Office: 1,202 Days
• US Class Current: 521/136
• CPC Class Codes: C08J 2329/14 Homopolymers or copolymers of acetals or ketals obtained by polymerisation of unsaturated acetals or ketals or by after-treatment of polymers of unsaturated alcohols
• CPC Class Codes: C08J 9/30 by mixing gases into liquid compositions or plastisols, e.g. frothing with air
• CPC Class Codes: Y10S 521/905 Hydrophilic or hydrophobic cellular product

Claims

1. THE METHOD OF MAKING A SPONGE MATERIAL HAVING INTERCONNECTION PORES WHICH COMPRISES FORMING A SUBSTANTIALLY STABLE DISPERSION OF BUBBLES IN AN AQUEOUS SOLUTION COMPRISING AN ACID IN WHICH THE ACID FUNCTIONAL GROUP IS INORGANIC AND HAVING A DISSOCIATION CONSTANT OF AT LEAST 10-2, A MEMBER OF THE CLASS CONSISTING OF A WATERSOLUBLE HYDROLYZED COPOLYMER OF ALLYIDENE DIETHOXIDE AND VINYL ACETATE, A MIXTURE OF SAID COPOLYMER AND POLYVINYL ALCOHOL, A WATER-SOLUBLE HYDROLYZED COPOLYMER OF ALLYLIDENE DIACETATE AND VINYL ACETATE, A MIXTURE OF SAID COPOLYMER AND POLYVINYL ALCOHOL, EACH OF SAID COPOLYMERS CONTAINING UP TO 15 MOL PERCENT OF THE ALLYLIDENE COMPOUND, AND A MIXTURE OF A DIALDEHYDE AND POLYVINYL ALCOHOL CONTAINING UP TO 15 MOL PERCENT OF SAID DIALDEHYDE, SAID POLYVINYL ALCOHOL CONTAINING LESS THAN 10% RESIDUAL HYDROLYZABLY MATERIAL IN THE MOLECULE, AND FORMALDEHYDE, AND REACTING SAID FORMALDEHYDE AND SAID MEMBER OF SAID CLASS UNTIL APPROXIMATELY 35 TO 80% OF THE HYDROXYL GROUPS OF THE REACTANTS HAVE REACTED.