# US 5,352,498 A · Package for compounding rubber and compounded rubber

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- Number: US 5,352,498 A
- Document ID: US5352498A
- Status: Granted
- Kind: A
- Application number: 07/932,115
- Filed: 1992-08-19
- Granted: 1994-10-04
- Earliest claimed: 1992-08-19
- Assignees: The Goodyear Tire & Rubber Company
- Inventors: Bharat K. Kansupada
- Web page: https://patentgrep.com/patent/US5352498A

## CPC

- C08J 3/226: {using a polymer as a carrier}
- B65D 65/38: Packaging materials of special type or form
- C08J 3/223: {Packed additives}
- C08J 2321/00: Characterised by the use of unspecified rubbers
- C08J 2467/00: Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- Y10T 428/1334: Nonself-supporting tubular film or bag [e.g., pouch, envelope, packet, etc.]
- Y10T 428/1345: Single layer [continuous layer]
- Y10T 428/1352: Polymer or resin containing [i.e., natural or synthetic]
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A package comprised of at least one compounding ingredient for unvulcanized rubber contained in a protective film of a thermoplastic polycaprolactone. The invention further relates to a compounded rubber comprised of a mixture of unsaturated rubber and a package of compounding ingredients contained in the polycaprolactone film. For such purposes, the polycaprolactone film can be in the form of a bag thereof.

## Claims

### Claim 1

A compounded rubber comprised of a mixture of unsaturated rubber and a package which comprises (A) compounding ingredients for unvulcanized rubber packaged in (B) a protective film having a thickness in the range of about 0.02 to about 0.08 mm consisting essentially of a thermoplastic polycaprolactone containing an anti-block agent and further characterized by a melting point in the range of about 60.degree. C. to about 70.degree. C., a melt flow index at 190.degree. C. and about 440 psi of about 5 to about 7 g/min, and a molecular weight (number average) in a range of about 70,000 to about 90,000.

### Claim 2 (depends on 1)

The compounded rubber of claim 1 wherein said compounding ingredients are comprised of (i) sulfur and at least one cure accelerator and, optionally, (ii) at least one of antioxidant(s), antiozonant(s), carbon black, zinc oxide, and a very small amount of rubber processing oil when mixed with at least one other of such compounding ingredients.

### Claim 3

A compounded rubber prepared by the steps of (A) blending an unvulcanized unsaturated diene-based elastomer and rubber compounding ingredients therefor, exclusive of sulfur and sulfur cure accelerators for rubber, in at least one non-productive mixing stage to form a non-productive blend; and (B) in a subsequent, productive mixing stage, blending at least one package which comprises (i) sulfur and sulfur cure accelerator(s) for rubber packaged in (ii) a protective film having a thickness in the range of about 0.02 to about 0.08 mm consisting essentially of a thermoplastic polycaprolactone containing an anti-block agent and further characterized by a melting point in the range of about 60.degree. C. to about 70.degree. C., a melt flow index at 190.degree. C. and about 440 psi of about 5 to about 7 g/min, and a molecular weight (number average) in a range of about 70,000 to about 90,000.

### Claim 4 (depends on 2)

The compounded rubber of claim 2 which is subsequently sulfur cured.

### Claim 5 (depends on 3)

The compounded rubber of claim 3 wherein said compounding ingredients are comprised of sulfur and sulfur cure activators for rubber.