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Adhesives for sealants and films for cover materials

A sealant and adhesive technology, applied in the direction of adhesives, adhesive types, polymer adhesive additives, etc., can solve the problems of insufficient bonding strength, decreased sealing performance, weak bonding strength, etc.

Active Publication Date: 2021-10-01
TOSOH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the conventional easy-peelable film is used as a lid material for A-PET containers, the adhesive strength is weak, so there is a problem that the lid will be opened due to vibration or drop during transportation or storage, or the In order to obtain high adhesive strength, the heat-sealing temperature is set higher, which causes the deformation of the container and the deterioration of the sealing performance.
In addition, if it is stored in a low-temperature environment after bonding, there is also a disadvantage that the sealing strength will decrease, which is a problem in actual use.
In general, a mixture containing polyethylene, ethylene-vinyl acetate copolymer, and a tackifier is known as an adhesive for a cover material sealant. However, in such materials, compared with A-PET container, unable to obtain sufficient bond strength
In addition, a resin composition comprising an ethylene-α-olefin copolymer, a tackifier, and an olefin-based elastomer and / or a styrene-based elastomer has been used (see, for example, Patent Document 1), a resin composition comprising an ethylene-α-olefin copolymer and ethylene-polar monomer copolymers, A-B-A type block copolymers, and sealing materials for tackifiers (see, for example, Patent Document 2), but these materials cannot satisfy all requirements of formability, sealing strength, and adhesive strength. characteristic

Method used

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  • Adhesives for sealants and films for cover materials
  • Adhesives for sealants and films for cover materials
  • Adhesives for sealants and films for cover materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] As the ethylene-vinyl acetate copolymer (A), 40 wt. Parts, resin (B1) (trade name Ultracene 626 manufactured by Tosoh Corporation) having a vinyl acetate content of 15% and a melt mass flow rate of 3.0 g / 10 minutes as an ethylene-vinyl acetate copolymer (B) 40 Parts by weight, 20 parts by weight of partially hydrogenated petroleum resin (C1) (Arakawa Chemical Co., Ltd. product name Alcon M115; softening temperature 115° C., hydrogenation rate of about 60% (NMR method)) as tackifier resin (C) After preliminary blending with a drum mixer, melt-kneading was performed at 180° C. using a twin-screw extruder to obtain pellets of an adhesive for sealants. The difference between the vinyl acetate content of the ethylene-vinyl acetate copolymer (A1) and the vinyl acetate content of the ethylene-vinyl acetate copolymer (B1) was 9% by weight. In addition, in the adhesive agent for sealants, 0.05 parts by weight of a phenolic antioxidant (manufactured by BASF Corporation, trade na...

Embodiment 2

[0089] Instead of 40 parts by weight of ethylene-vinyl acetate copolymer (A1), 35 parts by weight of ethylene-vinyl acetate copolymer (A1) was used, and ethylene-vinyl acetate copolymer (B1) was replaced by 40 parts by weight of ethylene-vinyl acetate copolymer. 35 parts by weight of vinyl acetate copolymer (B1), as the tackifier resin (C), instead of 20 parts by weight of partially hydrogenated petroleum resin (C1), fully hydrogenated petroleum resin (C2) (trade name manufactured by Arakawa Chemical Co., Ltd. Alcon P125; softening temperature 125°C, hydrogenation rate about 95% (NMR method)) 30 parts by weight, used as ethylene-α-olefin copolymer (D) with a density of 860kg / m 3 40 parts by weight of ethylene-α-olefin copolymer (D1) (manufactured by Mitsui Chemicals, Inc., trade name TAFMER P-0375), except that, in the same manner as in Example 1, an adhesive for sealants and a cover were obtained. Material film. The difference between the vinyl acetate content of the ethylen...

Embodiment 3

[0093] Instead of 35 parts by weight of the ethylene-vinyl acetate copolymer (B1), an ethylene-vinyl acetate copolymer (B2) with a vinyl acetate content of 10 parts and a melt mass flow rate of 9.0 g / 10 minutes (Tosoh ( Co., Ltd. product name Ultracene 541) 35 parts by weight, as a tackifier resin (C), instead of 30 parts by weight of fully hydrogenated petroleum resin (C2), 30 parts by weight of partially hydrogenated petroleum resin (C1) was used instead of ethylene-α- Olefin copolymer (D1) 40 parts by weight and the density used is 885kg / m 3 ethylene-α-olefin copolymer (D2) (manufactured by Tosoh Corporation, trade name LUMITAC BF300R) 40 parts by weight, except that, in the same manner as in Example 2, an adhesive for sealant and a cover material were obtained. membrane. The difference between the vinyl acetate content of the ethylene-vinyl acetate copolymer (A1) and the vinyl acetate content of the ethylene-vinyl acetate copolymer (B1) was 4% by weight.

[0094] The adh...

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Abstract

The object of the present invention is to provide an adhesive for sealant and a lid material that can be used for lid materials of A-PET containers that are excellent in formability and satisfy the sealing strength and adhesive strength to A-PET containers. Use film. The adhesive for the sealant of the cover material of the container comprises: 10-50 parts by weight of ethylene-vinyl acetate copolymer (A) with a vinyl acetate content of 3-15% by weight, and 8-25 parts by weight of vinyl acetate content. 10-50 parts by weight of ethylene-vinyl acetate copolymer (B) and 5-40 parts by weight of tackifier resin (C) (the total amount of (A), (B) and (C) is 100 parts by weight parts), the difference between the vinyl acetate content of the ethylene-vinyl acetate copolymer (A) and the vinyl acetate content of the ethylene-vinyl acetate copolymer (B) is 3 to 20% by weight.

Description

technical field [0001] The present invention relates to a film used as a cover material for a container, and more specifically, to an amorphous polyethylene terephthalate film which is excellent in moldability, can obtain high sealing strength and adhesive strength, and is excellent in heat resistance. Adhesives for sealants and films for lid materials of containers made of glycol ester (hereinafter A-PET). Background technique [0002] In the past, plastic containers such as polyethylene, polypropylene, and polystyrene, or paper-based containers were used for packaging of beverages, pharmaceuticals, and industrial parts, and the lid material was made of It is an easy-peelable film that has stable adhesive strength to protect the contents, and has easy-peelability that can be opened with moderate strength when peeled off. So far, many materials have been known for containers such as polypropylene and polystyrene, but in recent years, A-PET containers that are inexpensive an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J123/08C09J157/02C09J11/06C09J7/30C09J7/29
CPCC09J11/06C09J123/0853C08L2205/025C08L2205/03C09J2423/046C09J2423/04C09J2467/006C08L23/0853C08L57/02C08K5/1345C09J7/20C09J11/08C09J123/0815C09J2301/312
Inventor 森下功
Owner TOSOH CORP