Thermoplastic elastomer-silicone composition

Patent metadata

Field	Value
Publication number	US-2024084140-A1
Application number	US-202318509456-A
Country	US
Kind code	A1
Filing date	Nov 15, 2023
Priority date	Jan 15, 2018
Publication date	Mar 14, 2024
Grant date	—

Abstract

A composition including: (A) a copolymer having rigid blocks and flexible blocks (TPE), (B) a non-crosslinked polysiloxane silicone, preferably a non-crosslinked polyorganosiloxane, (C) a compatibilizer, improving the compatibility between the TPE and the silicone, the compatibilizer (C) being chosen from a polyolefin or a mixture of polyolefins, and optionally (D) an additive.

First claim

1 . A composition comprising:
(A) a block copolymer having rigid blocks and flexible blocks (TPE), and (B) a non-crosslinked polysiloxane silicone, wherein the non-crosslinked polyorganosiloxane has a poly(organo)siloxane backbone, the poly(organo)siloxane backbone having a polar functional group present at least at one of its ends, wherein the polar functional group is selected from the group consisting of a hydroxyl, an urea, an amine, an amide, a carboxylate, an ester, an acrylate, a thiol, a sulfonate, a sulfate and phosphate group, 5% to 45% of (C) a compatibilizer, improving the compatibility between the TPE and the silicone, chosen from a polyolefin or a mixture of polyolefins, and wherein the polyolefin or the mixture of polyolefins of the compatibilizer (C) carries a functional group chosen from maleic anhydride, carboxylic acid, carboxylic anhydride, and epoxide.

2 . The composition as claimed in claim 1 , wherein said rigid blocks comprise at least one block chosen from: polyamide, polyurethane, polyester, and their copolymers.

3 . The composition as claimed in claim 1 , wherein said flexible blocks comprise at least one block chosen from: polyether, polyester, polysiloxane, polyolefin, polycarbonate, and their copolymers.

4 . The composition as claimed in claim 1 , wherein the block copolymer is chosen from copolymers having polyester blocks and polyether blocks, copolymers having polyurethane blocks and polyether blocks and copolymers having polyamide blocks and polyether blocks.

5 . The composition as claimed in claim 1 , wherein the flexible blocks in the copolymer (A) are polyether blocks chosen from PTMG, PPG, PO3G and/or PEG.

6 . The composition as claimed in claim 2 , wherein the polyamide blocks in the block copolymer (A) are PA 11 and/or PA 12 blocks.

7 . The composition as claimed in claim 1 , wherein the ratio by weight of TPE (A) with respect to the silicone (B) is from 10:90 to 95:5.

8 . The composition as claimed in claim 1 , comprising, by weight:
from 55% to 95% of copolymer (A), from 5% to 45% of silicone (B), from 5% to 45% of compatibilizer (C), optionally, from 0% to 15% of at least one additive (D), with regard to the total weight of the composition, this being 100%.

9 . The composition as claimed in claim 1 , wherein the number-average molar mass Mn of the flexible blocks, is greater than 800 g/mol.

10 . The composition as claimed in claim 1 , wherein the ratio by weight of the rigid blocks, to the flexible blocks, in the copolymer (A) is less than or equal to 1.2.

11 . The composition as claimed in claim 1 , additionally comprising at least one additive (D) selected from the group consisting of: organic or inorganic fillers, reinforcing agents, plasticizers, stabilizers, antioxidants, UV stabilizers, flame retardants, carbon black, carbon nanotubes, pigments, dyes, mold-release agents, lubricants, foaming agents, impact-resistant agents, flame retardants, nucleating agents, surface-modifying agents and their mixtures.

12 . A process for the manufacture of the composition as claimed in claim 1 , comprising the step of mixing the block copolymer (A), the non-crosslinked silicone (B), and the compatibilizer (C).

13 . The process as claimed in claim 12 , wherein the mixing is carried out in a device for mixing in the molten state, at a temperature of the 150° C. to 250° C.

14 . An article comprising at least one part comprising the composition as claimed in claim 1 .

15 . The article as claimed in claim 14 , wherein said article is manufactured by a process involving at least one of the following stages: injection molding, overmolding, extrusion, or co-extrusion.

16 . The article as claimed in claim 14 , wherein said article is selected from the group consisting of a footwear sole, a sports footwear sole, an insole, midsole or outer sole, a ski boot liner, a sock, a racket, an inflatable ball, a solid ball, a floater, gloves, personal protection equipment, a helmet, a rail foot, a motor vehicle part, a pushchair part, a tire, a wheel, a smooth-riding wheel, a tire, a handle, a seat element, a child car seat part, a construction part, an electrical and/or electronic equipment part, an electronic protection part, an audio equipment, acoustic insulation and/or heat insulation part, a part targeted at dampening impacts and/or vibrations, an article of transport, a padding element, a toy, a medical object, a splint, an orthosis, a cervical collar, a dressing, an antimicrobial foam dressing, an art or handicraft object, a life jacket, a backpack, a membrane, a carpet, a sports mat, a sports floor covering, a carpet underlay, and any article comprising a mixture of these articles.

17 . The article as claimed in claim 14 , the article being selected from the group consisting of:
an article or article element of footwear; an optical article or optical article element; an automotive article or automotive article element; an article or article element used in manufacturing industry; a medical article or medical article element; and an electronic article or electronic article element.

18 . The article as claimed in claim 14 , the article being an electrical or electronic article comprising a casing or protective casing, a portable telephone, or a tablet.

Assignees

• Arkema France

Inventors

• Merzlic Sebastien
• Blondel Philippe
• Abgrall Florent
• Loyen Karine
• Rauline Damien
• Mougnier Sebastien-Jun

Classifications

• C08L51/04

  grafted on to rubbers · CPC title

• C08L87/005 Primary

  Block or graft polymers not provided for in groups C08L1/00 - C08L85/04 · CPC title

• C08J3/201

  Pre-melted polymers · CPC title

• C08L2203/20

  use in electrical or conductive gadgets · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title