Dental and biomedical foams and method

• US 3,903,232 A
• Filed: 02/19/1974
• Issued: 09/02/1975
• Est. Priority Date: 10/09/1973
• Status: Expired due to Term

• Current Assignee: Chase Manhattan Mortgage Corporation (JP Morgan Chase & Co)
• Original Assignee: Kurt Charles Frisch, Louis Leonard Wood
• Inventors: Frisch, Kurt Charles, Wood, Louis Leonard
• Primary Examiner(s): Czaja, Donald E.
• Assistant Examiner(s): Ivy, C. Warren
• Application Number:
  US05/443,271
• Time in Patent Office: 560 Days
• Field of Search: 128/285,29R 260/2.5AD,2.5A,2.5AM,29.2TN,2.5AP,2.5BD 32/15 264/157,321
• US Class Current: 264/157
• CPC Class Codes: A61K 6/893 Polyurethanes
• CPC Class Codes: A61K 8/0208 Tissues; Wipes; Patches
• CPC Class Codes: A61K 8/87 Polyurethanes
• CPC Class Codes: A61K 9/0036 Devices retained in the vagina or cervix for a prolonged period, e.g. intravaginal rings, medicated tampons, medicated diaphragms
• CPC Class Codes: A61L 15/425 Porous materials, e.g. foams or sponges
• CPC Class Codes: A61Q 13/00 Formulations or additives for perfume preparations essential oils or perfumes per se C11B9/00
• CPC Class Codes: A61Q 15/00 Anti-perspirants or body deodorants deodorisation of air A61L9/00
• CPC Class Codes: C08G 18/10 Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
• CPC Class Codes: C08G 18/4833 Polyethers containing oxyethylene units
• CPC Class Codes: C08G 18/8029 Masked aromatic polyisocyanates
• CPC Class Codes: C08G 2110/0083 prepared using water as the sole blowing agent
• CPC Class Codes: C08G 2310/00 Agricultural use or equipment
• CPC Class Codes: Y10S 521/905 Hydrophilic or hydrophobic cellular product
• CPC Class Codes: Y10S 521/918 Physical aftertreatment of a cellular product
• CPC Class Codes: Y10S 604/904 Tampons

Abstract

The invention disclosed is directed to dental and biomedical foam structures prepared by using an isocyanate capped polyoxyethylene polyol reactant with large amounts of an aqueous reactant. Sections of the resultant foam are compressed to a fraction of the original volume for ease and economy in handling, and upon contact with liquids or body fluids, the compressed foam section is readily regenerated to its original size and shape.

Claims

1. A METHOD FOR PREPARING DENTAL AND MEDICAL FOAM STRUCTURES HAVING OF AN IMPROVED CROSSLINKED HYDROPHLILIC FOAM HAVING THREE-DMINSIONAL NETWORKS, SAID METHOD CONSISTING ESSENTIALLY OF REACTING A FIRST COMPONENT COMPRISING ISOCYANATE CAPPED HYDROPHILIC POLYOXYETHYLENE POLYOL WITH AN ISOCYANATE FUNCTIONALITY GREATER THAN E AND SECOND CMPONENT COMPRISING WATER, WHEREIN THE H2O INDEX VALUE OF SAID CAPPED POLYOL AND WATER IS ABOUT 1,300 TO ABOUT 78,000, WHEREIN THE FIRST COMPONENT INCLUDES A CAPPED POLYOXYETHYLENE POLYOL MOIETY HAVING AN ISOCYANATE FUNCTIONALITY OF TWO PRESENT IN AN AMOUNT OF 0% BY WEIGHT UP TO 97% BY WEIGHT OF THE FIRST COMPONENT, AND THE POLYOXYETHLENE POLYOL MOIETY HAS A WEIGHT AVERAGE MOLECULAR WEIGHT OF ABOUT 200 TO ABOUT 20.000. AND A HYDROXYL FUNCTIONALITY OF ABOUT 2 TO ABOUT 8, COOLING OR DRYING THE PREPARED FOAM, AND CUTTING AND COMPRESSING COOLED OR DRIED FOAM SECTIONS.

2. The method of claim 1 wherein the weight average molecular weight is about 600 to about 6,000.

3. The method of claim 1 wherein the H2O Index Value is from about 4,000 to about 40,000.

4. The product prePared by the method of claim 1.

5. Catamenial devices prepared by the method of claim 1.

6. Tampon devices prepared by the method of claim 1.

7. A method for preparing dental and medical foam structures of an improved crosslinked hydrophilic foam having three-dimensional networks, said method consisting essentially of reacting a first component comprising isocyanate capped hydrophilic polyoxyethylene polyol, having a reaction functionality equal to about two, a second component comprising water, and a third component comprising a crosslinking agent having a reaction functionality greater than two, said crosslinking agent being polyol, polyamine, polythiol or polyisocyanate, and wherein the H2O Index Value of said capped polyol and water is about 1,300 to about 78,000, said crosslinking agent prior to foaming reaction being non-reactively disposed in the water component or the isocyanate capped component, cooling or drying the prepared foam, and cutting and compressing cooled or dried foam sections.

8. The method of claim 7 wherein the H2O Index Value is from about 4,000 to about 40,000.

9. The method of claim 7 wherein the crosslinking agent of the third component is a polyamine.

10. The product prepared by the method of claim 7.

11. Catamenial devices prepared by the method of claim 7.

12. Tampon devices prepared by the method of claim 7.