Thermoplastic elastomer-silicone composition

Abstract

The invention relates to a composition comprising: (A) a copolymer having rigid blocks and flexible blocks (TPE), (B) a non-crosslinked polysiloxane silicone, preferably a non-crosslinked polyorganosiloxane, optionally (C) a compatibilizer, improving the compatibility between the TPE and the silicone, the compatibilizer (C) being chosen from a polyolefin or a mixture of several polyolefins.

1 . A composition comprising:
 (A) a block copolymer having rigid blocks and flexible blocks (TPE), and   (B) a non-crosslinked polysiloxane silicone.   
     
     
         2 . The composition as claimed in  claim 1 , wherein the silicone is a non-crosslinked polyorganosiloxane. 
     
     
         3 . The composition as claimed in  claim 1 , additionally comprising:
 (C) a compatibilizer, improving the compatibility between the TPE and the silicone, chosen from a polyolefin or a mixture of several polyolefins.   
     
     
         4 . The composition as claimed in  claim 1 , wherein said rigid blocks comprise at least one block chosen from: polyamide, polyurethane, polyester and their copolymers. 
     
     
         5 . 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. 
     
     
         6 . 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. 
     
     
         7 . 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. 
     
     
         8 . The composition as claimed in  claim 4 , wherein the polyamide blocks in the block copolymer (A) are PA 11 and/or PA 12 blocks. 
     
     
         9 . 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. 
     
     
         10 . The composition as claimed in  claim 1 , comprising, by weight:
 from 55% to 95% of copolymer (A),   from 5% to 45% of silicone (B),   
       optionally
 from 0% to 45% of compatibilizer (C), 
 from 0% to 15% of additives (D), 
 
       with regard to the total weight of the composition, this being 100%. 
     
     
         11 . The composition as claimed in  claim 1 , wherein the number-average molar mass Mn of the flexible blocks, is greater than 800 g/mol. 
     
     
         12 . 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. 
     
     
         13 . The composition as claimed in  claim 3 , 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 functional groups. 
     
     
         14 . 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. 
     
     
         15 . A process for the manufacture of the composition as claimed in  claim 1 , comprising the step of mixing of block copolymer (A) and of non-crosslinked silicone (B), and of the optional components (C) and/or (D). 
     
     
         16 . The process as claimed in  claim 15 , wherein the mixing is carried out in a device for mixing in the molten state, at a temperature of 150° C. to 250° C. 
     
     
         17 . An article comprising at least one part comprising the composition as claimed in  claim 1 . 
     
     
         18 . The article as claimed in  claim 17 , wherein said article is manufactured by a process involving at least one of the following stages: injection molding, overmolding, extrusion or co-extrusion. 
     
     
         19 . The article as claimed in  claim 17 , 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. 
     
     
         20 . The article as claimed in  claim 17 , the article being selected from the group consisting of:
 an article or article element of footwear;   an optical article or article element: components of spectacle frames, nose pads or nosepieces, protective elements on frames;   an automotive article or article element: interior decorative element;   an article or article element of manufacturing industry: transmission or conveyor belt, silent gear;   a medical article or article element: patch, drug delivery system, sensor;   an electronic article or article element: headset, earphone, Bluetooth® jewelry or watch, display screen, connected watch, connected glasses, interactive game component or device, GPS, connected footwear, bioactivity monitor or sensor, interactive belt or bracelet, child or pet tracker, pocket scanner or palmtop, location sensors, and tracker or vision assist device.   
     
     
         21 . The article as claimed in  claim 17 , the article being an electrical or electronic article comprising a casing or protective casing, a portable computer, a portable telephone or a tablet.