# US 5,346,764 A · Resin laminates

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- Number: US 5,346,764 A
- Document ID: US5346764A
- Status: Granted
- Kind: A
- Application number: 08/073,291
- Filed: 1993-06-07
- Granted: 1994-09-13
- Earliest claimed: 1988-07-30
- Assignees: Idemitsu Petrochemical Co., Ltd.
- Inventors: Hiroshi Kudo; Shinji Kawamura
- Web page: https://patentgrep.com/patent/US5346764A

## CPC

- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- Y10T 428/2826: Synthetic resin or polymer
- Y10T 428/31913: Monoolefin polymer
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A resin laminate is composed of a heat-sealable layer (A) containing a random copolymer obtainable by copolymerizing ethylene with an .alpha.-olefin having from 4 to 10 carbon atoms, having a density ranging from 0.900 to 0.920 g/cm.sup.3, a melt index ranging from 5 to 50 grams per 10 minutes (190 .degree. C.), and a film thickness ranging from 2 to 15 .mu.m; and a polyolefinic resin layer (B) having a tensile modulus of 4,000 kg/cm.sup.2 or higher and a melting point higher than that of the heat-sealable layer (A), in which the heat-sealable layer (A) is laminated on the polyolefinic resin layer (B). The resin laminate has an excellent heat sealability and is particularly suitable for packing liquid, powdery or granular matters such as various food, beverages, chemicals and the like.

## Claims

### Claim 1

A resin laminate comprising: a heat-sealable layer (A) containing a random copolymer obtainable by copolymerizing ethylene with an .alpha.-olefin having from 4 to 10 inclusive carbon atoms, having a density ranging from 0.900 to 0.915 g/cm.sup.3, and a melt index ranging from 5 to 50 grams per 10 minutes (190.degree. C.); and
a linear low density polyethylene (LLDPE) layer (B) having a tensile modulus of 4,000 kg/cm.sup.2 or higher and a melting point higher than that of the heat-sealable layer (A),
wherein the heat-sealable layer (A) is laminated on the polyolefinic resin layer (B).

### Claim 2 (depends on 1)

The resin laminate of claim 1, wherein the heat-sealable layer (A) comprises a linear low density polyethylene (LLDPE) containing an .alpha.-olefin unit or a mixture of a linear low density polyethylene (LLDPE) in an amount of 70% by weight or larger with respect to the total weight of the heat-sealable layer (A) with a low-crystallinity ethylene-butene-1 copolymer in an amount of 30% by weight or lower with respect to the total weight thereof.

### Claim 3 (depends on 1)

The resin laminate as claimed in claim 1, wherein the heat-sealable layer (A) has a film thickness ranging from 2 to 15 .mu.m.

### Claim 4 (depends on 3)

The resin laminate of claim 3, wherein the heat-sealable layer (A) has a film thickness ranging from 2 to 10 .mu.m.

### Claim 5 (depends on 1)

The resin laminate of claim 1, wherein the linear low density polyethylene (LLPPE) layer (B) has a film thickness ranging from 5 to 200 .mu.m.

### Claim 6 (depends on 5)

The resin laminate of claim 5, wherein the linear low density polyethylene (LLPPE) layer (B) has a film thickness ranging from 10 to 100 .mu.m.

### Claim 7 (depends on 1)

The resin laminate of claim 1, wherein the linear low density polyethylene (LLDPE) layer (B) is laminated on a base film (C) on a surface of the linear low density polyethylene (LLDPE) layer (B) opposite to the surface thereof on which the heat-sealable layer (A) is laminated.

### Claim 8 (depends on 7)

The resin laminate as claimed in claim 7, wherein the base film (C) comprises a nylon film.

### Claim 9 (depends on 7)

The resin laminate of claim 7, wherein the base film (C) has a film thickness ranging from 10 to 100 .mu.m.

### Claim 10 (depends on 1)

The resin laminate of claim 1, wherein the heat-sealable layer (A) has a melt index ranging from 6 to 20 grams per 10 minutes (190.degree. C.).