Silicone rubber-based curable composition, method for producing silicone rubber, silicone rubber, molded article, and tube for medical use

Patent metadata

Field	Value
Publication number	US-9724451-B2
Application number	US-201214007622-A
Country	US
Kind code	B2
Filing date	Mar 29, 2012
Priority date	Mar 31, 2011
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

Abstract

The present invention provides a silicone rubber-based curable composition with which a silicone rubber having excellent tensile strength and tear strength is obtained, a method for producing a silicone rubber using the silicone rubber-based curable composition, a silicone rubber, a molded article using the silicone rubber, and a tube for medical use formed from the molded article. The silicone rubber-based curable composition of the present invention is characterized in that it includes a vinyl group-containing organopolysiloxane (A), an organohydrogen polysiloxane (B), silica particles (C), a silane coupling agent (D), and platinum or a platinum compound (E).

First claim

The invention claimed is:

1. A silicone rubber-based curable composition comprising:
a vinyl group-containing organopolysiloxane (A);
an organohydrogen polysiloxane (B), wherein the organohydrogen polysiloxane (B) is a linear organohydrogen polysiloxane (B1), and the linear organohydrogen polysiloxane (B1) does not contain a vinyl group;
silica particles (C);
a silane coupling agent (D); and
a platinum or a platinum compound (E),

wherein the vinyl group-containing organopolysiloxane (A) is a vinyl group-containing linear organopolysiloxane (A1), wherein the vinyl group-containing linear organopolysiloxane (A1) contains a first vinyl group-containing linear organopolysiloxane (A1-1) and a second vinyl group-containing linear organopolysiloxane (A1-2), the first vinyl group-containing linear organopolysiloxane (A1-1) having a content of the vinyl groups different from that of the second vinyl group-containing linear organopolysiloxane (A1-2),
the silane coupling agent (D) has a hydrolyzable group, and the hydrolyzable group is a silazane group,
the silica particles (C) are contained in a proportion of 35 parts by weight to 75 parts by weight, with respect to 100 parts by weight of the total amount of the vinyl group-containing organopolysiloxane (A) and the organohydrogen polysiloxane (B), and

the silane coupling agent (D) is contained in a proportion of 5 parts by weight to 100 parts by weight, with respect to 100 parts by weight of the silica particles (C).

2. The silicone rubber-based curable composition according to claim 1 , further comprising water (F).

3. The silicone rubber-based curable composition as described in claim 1 , wherein the silane coupling agent (D) is at least one selected from the group consisting of hexamethydisilazane and divinyltetramethyldisilazane.

4. The silicone rubber-based curable composition according to claim 3 , wherein the vinyl group-containing linear organopolysiloxane (A1) is represented by the following formula (1):

in the formula (1), m is an integer of 1 to 1000, n is an integer of 3000 to 10000, R 1 is a substituted or unsubstituted alkyl group, alkenyl group, or aryl group having 1 to 10 carbon atoms, or a hydrocarbon group formed by the combination of these groups, R 2 is a substituted or unsubstituted alkyl group, alkenyl group, or aryl group having 1 to 10 carbon atoms, or a hydrocarbon group formed by the combination of these groups, and R 3 is a substituted or unsubstituted alkyl group or aryl group having 1 to 8 carbon atoms, or a hydrocarbon group formed by the combination of these groups.

5. The silicone rubber-based curable composition according to claim 1 , wherein the content of the vinyl groups of the first vinyl group-containing linear organopolysiloxane (A1-1) is from 0.05% by mole to 0.2% by mole, and the content of the vinyl groups of the second vinyl group-containing linear organopolysiloxane (A1-2) is from 0.5% by mole to 12% by mole.

6. The silicone rubber-based curable composition according to claim 1 , wherein the linear organohydrogen polysiloxane (B1) is represented by the
following formula (2):

in the formula (2), m is an integer of 0 to 300 and n is an integer of (300-m). R 4 is a substituted or unsubstituted alkyl group, or aryl group having 1 to 10 carbon atoms, a hydrocarbon group formed by the combination of these groups, or a hydride group; R 5 is a substituted or unsubstituted alkyl group, or aryl group having 1 to 10 carbon atoms, a hydrocarbon group formed by the combination of these groups, or a hydride group; however, at least two or more out of plural R 4 s and R 5 s are hydride groups; R 6 is a substituted or unsubstituted alkyl group or aryl group having 1 to 8 carbon atoms, or a hydrocarbon group formed by the combination of these groups.

7. The silicone rubber-based curable composition according to claim 1 , further comprising a branched organohydrogen polysiloxane having a branched structure (B2).

8. The silicone rubber-based curable composition according to claim 7 , further comprising water (F).

9. The silicone rubber-based curable composition according to claim 7 , wherein the vinyl group-containing linear organopolysiloxane (A1) is represented by the following formula (1):

in the formula (1), m is an integer of 1 to 1000, n is an integer of 3000 to 10000, R1 is a substituted or unsubstituted alkyl group, alkenyl group, or aryl group having 1 to 10 carbon atoms, or a hydrocarbon group formed by the combination of these groups, R2 is a substituted or unsubstituted alkyl group, alkenyl group, or aryl group having 1 to 10 carbon atoms, or a hydrocarbon group formed by the combination of these groups, R3 is a substituted or unsubstituted alkyl group or aryl group having 1 to 8 carbon atoms, or a hydrocarbon group formed by the combination of these groups.

10. The silicone rubber-based curable composition according to claim 7 , wherein the linear organohydrogen polysiloxane (B1) is represented by the following formula (2):

in the formula (2), m is an integer of 0 to 300 and n is an integer of (300-m). R4 is a substituted or unsubstituted alkyl group, or aryl group having 1 to 10 carbon atoms, a hydrocarbon group formed by the combination of these groups, or a hydride group; R5 is a substituted or unsubstituted alkyl group, or aryl group having 1 to 10 carbon atoms, a hydrocarbon group formed by the combination of these groups, or a hydride group; however, at least two or more out of plural R4s and R5s are hydride groups; R6 is a substituted or unsubstituted alkyl group or aryl group having 1 to 8 carbon atoms, or a hydrocarbon group formed by the combination of these groups.

11. A silicone rubber-based curable composition comprising:
a vinyl group-containing organopolysiloxane (A);
an organohydrogen polysiloxane (B);
silica particles (C);
a silane coupling agent (D); and
a platinum or a platinum compound (E),
wherein the vinyl group-containing organopolysiloxane (A) is a vinyl group-containing organopolysiloxane (A1),
wherein the organohydrogen polysiloxane (B) comprises both of a linear organohydrogen polysiloxane having a linear structure (B1) and a branched organohydrogen polysiloxane having a branched structure (B2),
wherein the branched organohydrogen polysiloxane (B2) is represented by the following average composition formula (c):
average composition formula (c): (H a (R 7 ) 3-a SiO 1/2 ) m (SiO 4/2 ) n
in the formula (c), R 7 is a monovalent organic group, a is an integer in the range of 1 to 3, m is the number of H a (R 7 ) 3-a SiO 1/2 units, and n is the number of SiO 4/2 units,

wherein the silica particles (C) are contained in a proportion of 35 parts by weight to 75 parts by weight, with respect to 100 parts by weight of the total amount of the vinyl group-containing organopolysiloxane (A) and the organohydrogen polysiloxane (B), and
wherein the silane coupling agent (D) is contained in a proportion of 5 parts by weight to 100 parts by weight, with respect to 100 parts by weight of the silica particles (C).

12. A method for producing a silicone rubber, comprising:
a step of obtaining a kneaded product containing a vinyl group-containing organopolysiloxane (A), silica particles (C), and a silane coupling ag

Assignees

• Senoo Kazunobu
• Okada Jun
• Tsujimoto Motoyoshi
• Sumitomo Bakelite Co

Inventors

• Senoo Kazunobu
• Okada Jun
• Tsujimoto Motoyoshi

Classifications

• C08G77/20

  containing silicon bound to unsaturated aliphatic groups · CPC title

• C08G77/12

  containing silicon bound to hydrogen · CPC title

• C08L83/04

  Polysiloxanes · CPC title

• A61L29/049 Primary

  Mixtures of macromolecular compounds · CPC title

• A61L29/042 Primary

  Rubbers · CPC title