Laminate production method

Patent metadata

Field	Value
Publication number	US-2022106503-A1
Application number	US-201917273569-A
Country	US
Kind code	A1
Filing date	Aug 30, 2019
Priority date	Sep 5, 2018
Publication date	Apr 7, 2022
Grant date	—

Abstract

A laminate production method is provided which can sufficiently prevent the occurrence of blocking without causing deterioration in the outstanding characteristics of acrylic block copolymers such as adhesive performance, and can also ensure excellent processability during extrusion. The laminate production method includes a step (1) of bringing raw pellets of an acrylic block copolymer (A) into contact with an aqueous dispersion (C) containing acrylic resin particles (B) and no surfactants, the acrylic block copolymer (A) including at least one polymer block (a1) including acrylic acid alkyl ester units and at least one polymer block (a2) including methacrylic acid alkyl ester units, a step (2) of removing water attached to the pellets and thereby obtaining pellets (D), and a step (3) of preparing an adhesive composition using an adhesive feedstock including the pellets (D) from the step (2), and extruding the adhesive composition to form an adhesive layer and thereby producing a laminate including the adhesive layer and a substrate layer.

First claim

1 . A laminate production method comprising a step (1) of bringing raw pellets of an acrylic block copolymer (A) into contact with an aqueous dispersion (C) containing acrylic resin particles (B) and no surfactants, the acrylic block copolymer (A) comprising at least one polymer block (a1) including acrylic acid alkyl ester units and at least one polymer block (a2) including methacrylic acid alkyl ester units,
a step (2) of removing water attached to the pellets and thereby obtaining pellets (D), and a step (3) of preparing an adhesive composition using an adhesive feedstock comprising the pellets (D) from the step (2), and extruding the adhesive composition to form an adhesive layer and thereby producing a laminate comprising the adhesive layer and a substrate layer.

2 . The laminate production method according to claim 1 , wherein the adhesive layer and the substrate layer are both formed by extrusion in the step (3).

3 . A laminate production method comprising a step (1) of bringing raw pellets of an acrylic block copolymer (A) into contact with an aqueous dispersion (C) containing acrylic resin particles (B) and no surfactants, the acrylic block copolymer (A) comprising at least one polymer block (a1) including acrylic acid alkyl ester units and at least one polymer block (a2) including methacrylic acid alkyl ester units,
a step (2) of removing water attached to the pellets and thereby obtaining pellets (D), a step (2′) of bringing additional acrylic resin particles (B) into contact with the pellets (D) and thereby obtaining pellets (D′), and a step (3′) of preparing an adhesive composition using an adhesive feedstock comprising the pellets (D′) from the step (2′), and extruding the adhesive composition to form an adhesive layer and thereby producing a laminate comprising the adhesive layer and a substrate layer.

4 . The laminate production method according to claim 3 , wherein the adhesive layer and the substrate layer are both formed by extrusion in the step (3′).

5 . The laminate production method according to claim 3 , wherein the adhesive composition is prepared in the step (3′) by melt kneading of an adhesive feedstock comprising the pellets (D) and the pellets (D′).

6 . A laminate production method comprising a step of preparing an adhesive composition using an adhesive feedstock comprising pellets (D), and extruding the adhesive composition to form an adhesive layer and thereby producing a laminate comprising the adhesive layer and a substrate layer, wherein
the pellets (D) are pellets obtained through a step of bringing raw pellets of an acrylic block copolymer (A) into contact with an aqueous dispersion (C) containing acrylic resin particles (B) and no surfactants, the acrylic block copolymer (A) comprising at least one polymer block (a1) including acrylic acid alkyl ester units and at least one polymer block (a2) including methacrylic acid alkyl ester units, and the pellets (D) are such that the acrylic resin particles (B) are attached to the acrylic block copolymer (A).

7 . The laminate production method according to claim 1 , wherein the aqueous dispersion (C) comprises at least one selected from the group consisting of an aqueous dispersion (C-1) containing wet-ground acrylic resin particles (B), and an aqueous dispersion (C-2) containing dry-ground acrylic resin particles (B).

8 . The laminate production method according to claim 7 , wherein the aqueous dispersion (C) comprises an aqueous dispersion (C-1) containing wet-ground acrylic resin particles (B).

9 . The laminate production method according to claim 3 , wherein the aqueous dispersion (C) comprises at least one selected from the group consisting of an aqueous dispersion (C-1) containing wet-ground acrylic resin particles (B), and an aqueous dispersion (C-2) containing dry-ground acrylic resin particles (B).

10 . The laminate production method according to claim 6 , wherein the aqueous dispersion (C) comprises at least one selected from the group consisting of an aqueous dispersion (C-1) containing wet-ground acrylic resin particles (B), and an aqueous dispersion (C-2) containing dry-ground acrylic resin particles (B).

Assignees

• Kuraray Co

Inventors

• Ono Tomohiro
• Akai Makoto
• Kawahara Moe
• Nakada Kanayo

Classifications

• B29B9/16

  Auxiliary treatment of granules · CPC title

• B32B2262/106

  Carbon fibres, e.g. graphite fibres · CPC title

• B32B2551/00

  Optical elements · CPC title

• B32B23/08

  of synthetic resin · CPC title

• B32B2553/00

  Packaging equipment or accessories not otherwise provided for · CPC title