STABLE ELASTOMERIC POLYMER-OIL COMBINATIONS

• US 3,676,387 A
• Filed: 12/21/1970
• Issued: 07/11/1972
• Est. Priority Date: 12/21/1970
• Status: Expired due to Term

• Current Assignee: James A. Lindlof
• Original Assignee: James A. Lindlof
• Inventors: Lindlof, James A.
• Primary Examiner(s): Morris, Theodore
• Assistant Examiner(s): De Benedictis, Sr., T.
• Application Number:
  US05/100,520
• Time in Patent Office: 568 Days
• Field of Search: 260/33.6AQ,29.7GP,876B,28.5B
• US Class Current: 524/489
• CPC Class Codes: C08K 5/01 Hydrocarbons C08K5/0091 takes precedence
• CPC Class Codes: C08L 53/00 Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers

Abstract

A highly elastic synthetic polymer-oil combination meltable at high temperatures for casting from a liquid state, comprising 5 to 30 percent by weight of an unvulcanized elastomeric block copolymer composed of terminal glassy or resinous polymer blocks and a central elastomeric polymer block, and 70 to 95 percent by weight of a stable paraffin oil of low volatility and which has a flash point in excess of the melting temperature of the gel.

Claims

2. The elastomeric combination of claim 1 wherein each A of said block copolymer is a non-elastomeric polymer block having an average molecular weight of 2,000 - 100,000 and a glass transition temperature above about 25* C., and B is an elastomeric conjugated diene polymer blocK having an average molecular weight greater than about 15,000 and a glass transition temperature below about 10* C., the A content being about 10-50 percent by weight of the copolymer.

3. The elastomeric combination of claim 2 wherein said oil is mineral oil.

4. A flexible, soft, polymer-oil elastomeric combination comprising a nonaromatic paraffin oil and a block copolymer of the type A - B- A wherein each A is a thermoplastic polymer block with a glass transition temperature above room temperature having an average molecular weight between about 5,000 and 125,000, the end blocks A of the block copolymer constituting approximately 10-50 percent of the total polymer weight, and B is a polymer block of a conjugated diene having an average molecular weight between about 15,000 and 1,000,000 said oil being uniformly distributed throughout said polymer in an amount sufficient to provide between about 80 to 95 percent by weight oil and 5 to 20 percent by weight of block-copolymer, said combination having a modulus of elasticity of 1 to 10 psi for 200 percent elongation of a 1 square inch cross section.

5. An elastomeric combination according to claim 4 wherein said combination contains a low melting paraffin wax having a melting point below 130* F.

6. A flexible, soft polymer-oil elastomeric combination comprising an incompatible, inert liquid oil and block copolymer of the type A - B - A wherein each A is a thermoplastic polymer block with a glass transition temperature above room temperature having an average molecular weight between about 5,000 and 125,000, the end blocks A of the block copolymer constituting approximately 10-50 percent of the total polymer weight, and B is a polymer block of a conjugated diene having an average molecular weight between about 15,000 and 1,000,000, said inert liquid being uniformly distributed throughout said polymer in an amount sufficient to provide between 70-95 percent by weight inert liquid and 5-30 percent of block copolymer, said inert liquid being at least one-half nonaromatic paraffin oil, said combination having a modulus of elasticity of 1 to 10 psi for 200 percent elongation of a 1 square inch cross section.

7. The combination of claim 6 wherein said inert liquid comprises an incompatible glycol and a paraffin oil.

8. The combination of claim 6 wherein said inert liquid comprises water and a paraffin oil.

9. A molded article comprising:

a synthetic polymer-oil elastomeric combination which is stable at ambient temperatures and meltable for casting in a liquid state at elevated temperatures, comprising, in combination, 5 to 30 weight percent of an A-B-A type unvulcanized elastomeric block copolymer wherein each A block is a glassy or resinous, non-elastomeric, thermoplastic polymer block with a glass transition temperature above room temperature and having an average molecular weight of between about 2,000 and 100,000, the end blocks A of the block copolymer constituting approximately 10-50 percent of the total polymer weight, and the B block is an elastomeric polymer block of a conjugated diene having an average molecular weight between about 15,000 and 1,000,000 and having a glass transition temperature below that of the A block; and

70-95 weight percent of a stable, nonaromatic paraffin oil of low volatility and having a boiling point in excess of the melting temperature of the said elastomeric block copolymer.

10. The molded article of claim 9 wherein said oil is mineral oil.