# US 5,346,539 A · Flame-retardant adhesive

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- Number: US 5,346,539 A
- Document ID: US5346539A
- Status: Granted
- Kind: A
- Application number: 08/037,380
- Filed: 1993-03-26
- Granted: 1994-09-13
- Earliest claimed: 1991-07-26
- Assignees: Sumitomo Electric Industries, Ltd.
- Inventors: Norihiro Hosoi; Shuji Azuma
- Web page: https://patentgrep.com/patent/US5346539A

## CPC

- C09J 11/02: Non-macromolecular additives
- Y10S 428/921: Fire or flameproofing
- Y10T 428/1328: Shrinkable or shrunk [e.g., due to heat, solvent, volatile agent, restraint removal, etc.]
- Y10T 428/1331: Single layer [continuous layer]
- C09J: ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES (preparation of glue or gelatine C09H)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Disclosed is a flame-retardant hot-melt adhesive to be applied to the inner surface of a heat-shrinkable tube, It contains 100 parts by weight of a resin composition having an MI value (190.degree. C.) of 30-220, 5-40 parts by weight of a chloric or bromic flame-retardant, 1-30 parts by weight of an inorganic flame-retardant and 0.1-20 parts by weight of fine powder having an average particle diameter between 0.01 and 40 microns. It is a flame-retardant adhesive which shows good fluidity when subjected to external force and no dropping occurs if it burns.

## Claims

### Claim 1

A flame-retardant adhesive comprising 100 parts by weight of a resin composition having an MI value (at 190.degree. C.) of 30-220, 5-40 parts by weight of a chloric or bromic flame-retardant wherein said chloric flame-retardant contains 65 wt % or more of chlorine and said bromic flame-retardant contains 80 wt % or more of bromine, 1-30 parts by weight of an inorganic flame-retardant and 0.1-20 parts by weight of silica powder having an average particle diameter of 0.01 to 40 microns.

### Claim 2 (depends on 1)

The flame-retardant adhesive as claimed in claim 1 wherein said resin composition is selected from the group consisting of a resin obtained by polymerizing ethylene and vinyl acetate as main monomers and having a melting point between 60.degree. C. and 100.degree. C., a polyester resin having a melting point between 80.degree. C. and 190.degree. C. and a polyamide resin having a melting point between 50.degree. C. and 95.degree. C.

### Claim 3 (depends on 1)

The flame-retardant adhesive as claimed in claim 1, which shows a bond strength of 0.2 kg/cm or higher as measured by bonding said adhesive to flat and smooth-surfaced sample plates made of polyethylene, PVC (polyvinyl chloride) and an ethylene-vinyl acetate copolymer, cooling said adhesive and said sample plates to room temperature, and pulling said adhesive with a tension tester in such a direction that said adhesive is peeled off from the sample plates.

### Claim 4

A heat-shrinkable tube comprising a heat-shrinkable tube body having an inner and outer surface, and a flame-retardant adhesive applied to said inner surface, said flame-retardant adhesive comprising 100 parts by weight of a resin composition having an MI value at (190.degree. C.) of 30-220, 5-40 parts by weight of a chloric or bromic flame retardant, wherein said chloric flame-retardant contains 65 wt % or more of chlorine and said bromic flame-retardant contains 80 wt % or more of bromine, 1-30 parts by weight of an inorganic flame-retardant and 0.1-20 parts by weight of silica powder having an average particle diameter of 0.01 to 40 microns.

### Claim 5 (depends on 4)

The heat-shrinkable tube as claimed in claim 4, wherein said heat-shrinkable tube body comprises a base resin which comprises one or a mixture of two of polyethylene, an ethylene-vinyl acetate copolymer and an ethylene-ethyl acrylate copolymer, 5-40 parts by weight of a chloric or bromic flame-retardant, and 1-30 parts by weight of inorganic flame-retardant and wherein said tube body without said adhesive exhibits a flame retardancy high enough to pass the All Tubing Flame Test, which is a flame-retardancy evaluation test defined in the UL standard.

### Claim 6

A harness having a waterproof joint portion, said joint portion being covered with a heat-shrinkable tube comprising a heat-shrinkable tube body having an inner and outer surface and having a flame-retardant adhesive applied to said inner surface, said flame-retardant adhesive comprising 100 parts by weight of a resin composition having an MI value (at 190.degree. C.) of 30-220, 5-40 parts by weight of a chloric or bromic flame retardant, wherein said chloric flame-retardant contains 65 wt % or more of chlorine and said bromic flame-retardant contains 80 wt % or more of bromine, 1-30 parts by weight of an inorganic flame-retardant and 0.1-20 parts by weight of silica powder having an average particle diameter of 0.01 to 40 microns.