Patent application EP19177250A (EP), filed 2019-05-29
Publication number: EP3744757A1
Title: SILICONE MIXTURE AND CURED PRODUCT THEREOF
Abstract: It is an object of the present invention to provide a silicone rubber compatible with human bodies. A silicone admixture according to the present invention comprises a millable silicone rubber, a silicone high polymer having no cross-linking site, a vulcanizing agent, and a rubber reinforcing silica. A cured product obtained by curing the silicone admixture has loss tangent (Tan δ) of 0.3 or more and 0.6 or less at 0°C to 50°C. The millable silicone rubber can be a millable silicone rubber produced in a wet manner and having high tear resistance. The silicone high polymer can be a dimethyl silicone high polymer.
IPC codes: C08G  77/    20            A I
C08K   5/    00            A I
C08L  83/    04            A I
Claims: number: 1
text: A silicone admixture, comprising:
number: 2
text: The silicone admixture according to claim 1, wherein the silicone high polymer is a dimethyl silicone high polymer.
number: 3
text: The silicone admixture according to claim 1 or 2, wherein the vulcanizing agent is a peroxide based vulcanizing agent.
number: 4
text: The silicone admixture according to any of claims 1 to 3, further comprising an organosilicone based lubricant.
number: 5
text: The silicone admixture according to any of claims 1 to 4, wherein the silicone admixture comprises 40 parts or more by weight of the silicone high polymer based on 100 parts by weight of the total of the millable silicone rubber and the silicone high polymer.
number: 6
text: The silicone admixture according to any of claims 1 to 5, wherein the silicone admixture comprises 0.1 parts or more by weight and 20 parts or less by weight of the rubber reinforcing silica based on 100 parts by weight of the total of the millable silicone rubber and the silicone high polymer.
number: 7
text: A cured product of the silicone admixture according to any of claims 1 to 6.
Office action: search_report, dated 2020-12-02
Rejection reasons: novelty_epc_54
Prior art cited: ref_id: JP5462425B1
ref_type: patent
severity: background
ref_id: - TAKAHASHI MOTOJI, POLYMERS, vol. 33, pages 1984
ref_type: npl
severity: background
ref_id: JP2002114869A
ref_type: patent
severity: background
ref_id: GB2335660A
ref_type: patent
severity: background
ref_id: GB2335660
ref_type: patent
severity: novelty_destroying
ref_id: JP2002114869
ref_type: patent
severity: novelty_destroying
Final disposition: pending (2020-12-02)