Soft skin adhesive composition

Abstract

A silicone gel-forming composition is provided that contains an α-dimethylvinylsiloxy-ω-dimethylhydride-terminated polydimethylsiloxane, an α-dimethylvinylsiloxy-ω-n-butyl-terminated polydimethylsiloxane, and a hydrosilylation catalyst. Upon curing, the gel has good adhesion to skin and is painless to apply and remove from the skin.

Description

[Technical Field]

[0001] Cross-references to applications This application claims priority to U.S. Provisional Application No. 63 / 429,630, filed December 2, 2022, the disclosure of which is incorporated by reference in its entirety into this application. [Background technology]

[0002] Skin-adhesive silicone gels are commonly known and widely used. Such gels have many applications, including wearable sensors (glucose, heart rate, pulse, UV sun exposure patches, EKG, etc.), wound care, wound and skin treatment, and drug delivery. Conventional compositions typically contain a combination of vinyl-functional MQ resins (siloxane copolymers formed from common reactive or non-reactive trialkylsilyl ("M") and tetraalkylsilyl ("Q") structures), vinyl linear siloxanes, SiH chain extenders, and SiH crosslinkers. For example, WO 2005 / 102403; WO 2008 / 057155; U.S. Patent No. 5,145,933; U.S. Patent No. 11,051,989; U.S. Patent No. 10,758,640; and U.S. Patent No. 10,662,330 disclose various silicone skin adhesive gel compositions. Although there are variations in these formulations, all of these gels contain alkenyl-functional polysiloxanes and SiH-functional siloxanes that differ in the number of SiH groups per any given molecule, the viscosity of the SiH-functional siloxane, the molar ratio of SiH to alkenyl-functional groups, the placement of the SiH groups on the siloxane molecule, the overall SiH content in the gel formulation, and the SiH content in the chain extender and crosslinker relative to the SiH content in the SiH-functional crosslinker or resin. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2005 / 102403 [Patent Document 2] International Publication No. 2008 / 057115 [Patent Document 3] U.S. Patent No. 5,145,933 [Patent Document 4] U.S. Patent No. 1,105,1989 [Patent Document 5] U.S. Patent No. 1,075,8640 [Patent Document 6] U.S. Patent No. 10,662,330 Summary of the Invention [Problem to be solved by the invention]

[0004] More specifically, conventional compositions contain a dimethylvinyl α,ω-end-modified siloxane, a SiH siloxane crosslinker (having three or more SiH functional groups), and an α-ω-dimethylhydride end-modified chain extender siloxane. Some known compositions also contain a vinyl-functional silicone resin. However, while these formulations have good skin adhesion, there is room for improvement in the overall strength of these adhesives for handling and adhering larger or heavier objects to the skin. Gel adhesives must be able to be removed from the skin painlessly via a peeling mechanism. Therefore, there is a need for a soft skin adhesive composition that has higher adhesive strength than known compositions and can be removed / peeled from the skin painlessly. [Means for solving the problem]

[0005] In one embodiment, aspects of the present disclosure include: (a) α-dimethylvinylsiloxy-ω-dimethylhydride-terminated polydimethylsiloxane; (b) a chain terminator comprising a moiety having formula (I) and / or formula (II) [ka] ;and (c) Hydrosilylation catalyst 1. A silicone gel-forming composition comprising: R 1 is a terminal alkenyl group having 2 to about 22 carbon atoms, and R 5 is a straight or branched chain alkyl group having 1 to about 8 carbon atoms; R 6 is hydrogen or a terminal alkene having 2 to about 22 carbon atoms, and each R 2 and R 3 are independently a straight or branched chain alkyl group having from 1 to about 8 carbon atoms, and o is an integer such that the viscosity of the component having formula (II) is from about 2 to about 20,000 mPas.

[0006] In a second embodiment, aspects of the present disclosure include: (a) α-dimethylvinylsiloxy-ω-dimethylhydride-terminated polydimethylsiloxane; (b) a chain terminator comprising an alpha olefin or a siloxane containing one vinyl group or one terminal hydride group; and (c) Hydrosilylation catalyst The present invention relates to a silicone gel-forming composition comprising:

[0007] Advantageous refinements of the invention, which can be implemented alone or in combination, are defined in the dependent claims.

[0008] In summary, the following embodiments are proposed as being particularly preferred within the scope of the present invention.

[0009] Embodiment 1: (a) α-dimethylvinylsiloxy-ω-dimethylhydride-terminated polydimethylsiloxane; (b) a chain terminator comprising a moiety having formula (I) and / or formula (II) [ka] ;and (c) Hydrosilylation catalyst 1. A silicone gel-forming composition comprising: In the formula, R1 is a terminal alkenyl group having 2 to about 22 carbon atoms, and R 5 is a straight or branched chain alkyl group having 1 to about 8 carbon atoms; R 6 is hydrogen or a terminal alkene having 2 to about 22 carbon atoms, and each R 2 and R 3 are independently a straight or branched chain alkyl group having from 1 to about 8 carbon atoms, and o is an integer such that the viscosity of the component having formula (II) is from about 2 to about 20,000 mPas.

[0010] Embodiment 2: The composition of embodiment 1, wherein component (a) has Formula (III) and a viscosity of about 50 to about 1000 mPas. [ka]

[0011] Embodiment 3: The composition of embodiment 1 or 2, wherein component (b) is an α-dimethylvinylsiloxy-ω-n-butyl terminated polydimethylsiloxane.

[0012] Embodiment 4: The composition of any of embodiments 1-3, comprising about 350 parts of component (a), about 0.5 to about 10 parts of component (b), and about 0.01 to about 1 part of component (c).

[0013] Embodiment 5: The composition of any of embodiments 1-4, further comprising component (d), an α,ω-dimethylhydridosiloxy-terminated polydimethylsiloxane chain extender.

[0014] Embodiment 6: The method of any one of embodiments 1-5, wherein component (d) comprises a polymer having formula (IV) and has a viscosity of about 2 to about 10,000 mPas. [ka]

[0015] Embodiment 7: The composition of any of embodiments 1-6, further comprising a component (e) that is an α,ω-dimethylvinylsiloxy-terminated polydimethylsiloxane.

[0016] Embodiment 8: The composition of any of embodiments 1-7, wherein component (e) comprises a polymer having formula (V) and has a viscosity of about 2 to about 10,000 mPas. [ka]

[0017] Embodiment 9: The composition of any of embodiments 1-8, further comprising a component (f) that is a linear vinyl siloxane.

[0018] Embodiment 10: The composition of any of embodiments 1-9, wherein component (f) comprises a polymer having formula (VI) and has a viscosity of about 10 to about 10,000 Pas, a is about 45 to 97 mole % compared to b, and the polymer having formula (VI) has at least three silicon-bonded hydrogen atoms. [ka]

[0019] Embodiment 11: The composition of any of embodiments 1-10, further comprising at least one component (g) that is a rate control agent or rate inhibitor.

[0020] Embodiment 12: The composition of any of embodiments 1-11, wherein component (g) is selected from the group consisting of 2-methyl-3-butyn-2-ol, 1-ethynyl-cyclohexanol, diallyl maleate, triallyl isocyanurate, 1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane, and triphenyl phosphite.

[0021] Embodiment 13: A silicone gel obtained by heating and curing the composition according to any one of embodiments 1 to 12.

[0022] Embodiment 14: (a) α-dimethylvinylsiloxy-ω-dimethylhydride terminated polydimethylsiloxane; (b) a chain terminator comprising an alpha olefin or a siloxane containing one vinyl group or one terminal hydride group; and (c) Hydrosilylation catalyst 1. A silicone gel-forming composition comprising:

[0023] Embodiment 15: Component (b) is a siloxane having the formula (VII): [ka] 15. The composition of embodiment 14, wherein n is an integer such that the component having formula (VII) has a viscosity of from about 2 to about 20,000 mPas.

[0024] Embodiment 16: A silicone gel obtained by heating and curing the composition according to embodiment 14 or 15.

[0025] The foregoing summary, as well as the following detailed description of the invention, will be better understood when read in conjunction with the accompanying drawings. For the purpose of illustrating the invention, there are set forth in the drawings embodiments which are presently preferred. It should be understood, however, that the invention is not limited to the precise arrangements and devices shown. [Brief explanation of the drawings]

[0026] [Figure 1] FIG. 1 is a side view of a test apparatus for testing compositions according to embodiments of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0027] According to an aspect of the present disclosure, there is provided a method for manufacturing a cellular telephone comprising: (a) α-dimethylvinylsiloxy-ω-dimethylhydride-terminated polydimethylsiloxane; (b) a chain terminator comprising a moiety having formula (I) and / or formula (II) [ka] ;and (c) Hydrosilylation catalyst 1. A silicone gel-forming composition comprising: In the formula, R 1 is a terminal alkenyl group having 2 to about 22 carbon atoms, and R 5 is a straight or branched chain alkyl group having 1 to about 8 carbon atoms; R 6 is hydrogen or a terminal alkene having 2 to about 22 carbon atoms, and each R 2 and R 3 are independently a straight or branched chain alkyl group having 1 to about 8 carbon atoms, and o is an integer such that the viscosity of the component having formula (II) is about 2 to about 20,000 mPas.

[0028] Component (a) is a mono-hydride / mono-vinyl siloxane (α-dimethylvinylsiloxy-ω-dimethylhydride terminated polydimethylsiloxane) such as that having the formula (III). [ka] The variable d, which represents the number of repeating units, is an integer selected so that the viscosity of component (a) is from about 50 to about 1000 mPas.

[0029] Component (b) is a chain terminator or end-capping agent that functions to terminate the polymer chain and make its end unreactive, and contains a moiety having formula (I) and / or formula (II). In formula (I), preferred R 1 The group includes -CH=CH2, -CH2CH=CH2, -CH2CH2CH=CH2, -CH2CH2CH2CH2CH=CH2, etc., and the most preferred R 1 is vinyl. More generally, R in formula (I) 1 is -(CH2) x CH=CH2, and x is an integer from 0 to about 20. 5 The group is a small straight chain alkyl group such as methyl, ethyl and propyl, most preferably methyl.

[0030] In formula (II), R 2 and R 3 R may be the same or different and are both preferably small alkyl groups such as methyl, ethyl, propyl or butyl. 6 may be hydrogen or a terminal alkene such as -CH=CH, -CHCH=CH, -CHCHCH=CH, -CHCHCHCH=CH, or -CHCHCHCHCH=CH. More generally, R in formula (II) 6 is -(CH2) x CH=CH2, and x is an integer from 0 to about 20. Preferably, R 6 is hydrogen or a vinyl group.

[0031] A preferred component (b) is an α-dimethylvinylsiloxy-ω-n-butyl terminated polydimethylsiloxane such as that having the formula: [ka]

[0032] Other preferred endblocker components include those having the following structure: [ka]

[0033] Component (c) can be, for example, Karstedt's catalyst (known to those skilled in the art and disclosed in U.S. Patent No. 3,775,452), such as diluted in α,ω-dimethylvinylsiloxy-terminated PDMS and containing 3.0-3.5 wt. % Pt. Other platinum hydrosilylation catalysts known to those skilled in the art or to be developed, such as Spier's catalyst, can also be employed to catalyze the SiH to vinyl hydrosilylation reaction.

[0034] A typical composition contains about 350 parts of component (a), about 0.5 to about 10 parts of component (b), preferably about 1 to about 5 parts of component (b), and most preferably about 1.5 to about 3 parts of component (b), and a catalytic amount of component (c), such as about 0.01 to about 1 part, preferably about 0.1 to about 0.5 parts.

[0035] Additional optional components may be present in the composition. For example, optional component (d), which functions as a SiH siloxane chain extender, may be an α,ω-dimethylvinylsiloxy-terminated polydimethylsiloxane such as that having formula (IV). The variable y, representing the number of repeating units, is an integer selected so that the viscosity of component (d) is from about 2 to about 10,000 mPas, preferably from about 20 to about 80 mPas. [ka]

[0036] Optional component (e) is an α,ω-dimethylvinylsiloxy-terminated polydimethylsiloxane such as that having the formula (V). [ka] The variable m, which represents the number of repeating units, is an integer selected so that the viscosity of component (e) is from about 2 to about 10,000 mPas, preferably from about 100 to about 3,000 mPas, and more preferably from about 500 to about 2,000 mPas.

[0037] Optional component (f) is a standard linear vinyl siloxane such as an α,ω-dimethylhydridosiloxy-terminated polydimethylsiloxane having formula (VI). [ka] In formula (VI), "a" is preferably about 45 to about 97 mole % compared to "b," (f) has at least three silicon-bonded hydrogen atoms in the molecule, and "a" and "b" are integers selected such that the viscosity of (f) is about 10 to about 10,000 mPas, preferably about 10 to about 1000 mPas, and more preferably about 10 to about 50 mPas.

[0038] Optional component (g) is a rate control agent / inhibitor such as, for example, 2-methyl-3-butyn-2-ol, 1-ethynyl-cyclohexanol, diallyl maleate, triallyl isocyanurate, 1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane, and triphenyl phosphite. However, other rate control agents and inhibitors commonly known or developed by those skilled in the art are also within the scope of this disclosure. The scope of this disclosure includes one or more of these compounds as component (g).

[0039] A typical composition according to an embodiment of the present disclosure contains 350 parts of component (a), 0 to about 50 parts of (d), 0 to about 50 parts of (e), 0 to about 2 parts of (f), and 0 to about 1.4 parts of (g), provided that the molar ratios of silicon-bonded hydrogen to vinyl in (d) and (e) disclosed above are employed. Preferred compositions contain 0 to about 20 parts of (d), more preferably 0 to about 5 parts of (d), 0 to about 20 parts of (e), more preferably 0 to about 5 parts of (e), 0 to about 1.8 parts of (f), more preferably 0 to about 1.4 parts of (f), and 0 to about 1 part of (g), more preferably 0 to about 0.5 parts of (g).

[0040] Component (a) is included in the formulation and reacts with itself in the presence of component (c) to provide a low durometer, soft silicone that, upon curing, has high tensile strength and elongation in tension. The compositions disclosed herein have a fairly low viscosity, but due to the long chain length, provide the cured physical properties typically found in higher viscosity formulations. The addition of a small amount of component (b) imparts greater extensibility and strength to the cured silicone, resulting in some long, non-reactive polymer chains that add adhesive and tack when (a), (c), and (b) are heated and cured.

[0041] The use of a mono-hydride / mono-vinyl siloxane (a) in conjunction with a siloxane chain terminator (b) has been found to result in the formation of a cured gel that exhibits improved adhesive strength compared to prior art adhesives, yet does not cause pain when the adhesive is peeled from the skin. The use of a mono-hydride / mono-vinyl siloxane with a SiH siloxane chain extender (d) and a standard linear vinyl siloxane (f), which contain approximately equal molar amounts of SiH and vinyl groups, also provides a formulation with improved adhesive strength.

[0042] A variety of different chain terminators are also included within the scope of this disclosure, including, for example, alpha olefins, versions of component (b) using SiH instead of Si-vinyl, and siloxanes with only one vinyl or SiH group, such as components having formula (VII). [ka] In formula (VII), n is an integer that gives the component having formula (VII) a viscosity of about 2 to about 20,000 mPas.

[0043] The soft skin adhesive composition according to the present disclosure may be formed into a gel (cured) by heating and curing at elevated temperatures. Suitable heating times and durations may be determined by routine experimentation depending on the particular compound, but may include heating at about 90 to 150°C, preferably about 100°C, for about 1 to about 16 hours.

[0044] Due to their high adhesive strength and painless application and removal from the skin, the gels as disclosed herein have many applications such as for integrating wearable sensors (various materials such as glucose, heart rate, pulse, UV sun exposure patches, EKG, etc.), wound care, wound and skin treatment and drug delivery.

[0045] Unless otherwise stated, any numerical value set forth herein is understood to be modified in all instances by the term "about." Thus, numerical values ​​typically include ±10% of the stated value. For example, a description of a temperature such as "10°C" or "about 10°C" includes 9°C and 11°C, and all temperatures therebetween. Furthermore, all numerical ranges expressed in this disclosure expressly include all possible subranges of that range, individual numerical values ​​of that range, and fractions and decimals of those numerical values, including integers within the range, unless the context clearly dictates another range. [Example]

[0046] The invention is hereinafter disclosed with reference to non-limiting examples.

[0047] A gel-forming composition containing the ingredients disclosed below was prepared, and 12 mm thick samples were cured in aluminum pans at 100°C for 1 hour, then cooled to room temperature to obtain four cured gels (two inventive and one conventional). Testing adhesives on skin has been found to be difficult because the skin surface varies and differs depending on race, age, sex, and natural genetic differences. On the other hand, testing on PET provides a surface that energetically resembles skin.

[0048] As shown in Figure 1, the cured gels below were analyzed by a loop tack test using a 203.2 mm long, 80.645 mm wide, 0.0045 inch PET film with a pull rate of 508 mm / min. The PET was clamped end-to-end in a Stable Micro Systems TA-XT plus Texture Analyzer and formed into a 152.4 mm long loop. The clamps on the texture analyzer were lowered until the PET film formed a cured silicone gel adhesive sample measuring 161.3 mm in diameter and 16.5 mm thick. The center of the PET loop was pressed onto the cured silicone gel adhesive, such that the cross-section of the cured adhesive measured 12.7 mm x 12.7 mm. A small amount of pressure was applied with one finger (as if applying an adhesive bandage) to ensure the adhesive was thoroughly wetted over the entire 12.7 mm x 12.7 mm area. The clamps were then raised at 508 mm / min, and the maximum force was measured.

[0049] Example 1: Gel 1 of the present invention 350 g of (A) α-dimethylvinylsiloxy-ω-dimethylhydride-terminated polydimethylsiloxane having a viscosity of 150-350 cP and 2.92 g of (B) α-dimethylvinylsiloxy-ω-n-butyl-terminated polydimethylsiloxane having a viscosity of 80-120 cP were combined in a 300 GRAM MAX TALL Flacktek SpeedMixer cup and mixed by hand with a spatula. Next, 0.035 g of Karstedt's hydrosilylation catalyst (C), an α,ω-dimethylvinylsiloxy-terminated PDMS containing 3.0-3.5% Pt, was added to (A) and (B) in the cup and mixed by hand with a spatula. The mixture was then mixed in a Flacktek SpeedMixer model DAC 600.2 VAC-p centrifugal mixer at 800 rpm for 1 minute under vacuum, 35 rpm for 45 seconds, and immediately thereafter at 2350 rpm for 15 seconds under the same vacuum.

[0050] The order of component addition is important. For example, components (A) and (C) can be combined and blended by hand, followed by the addition and manual blending of (B), followed by mixing in a mixer. However, (C) and (B) should not be combined and then followed by (A). Any mixer capable of thoroughly mixing the raw materials can be used. Typically, the mixer is placed under vacuum to remove air, but this step can also be performed after mixing. The entire mixing is performed at room temperature, and heating is not recommended during the mixing process. In fact, for large-scale production, the mixing temperature should preferably be below 40°C. After curing at 100°C for 1 hour, the cured gel was analyzed using the loop adhesion test described above. The loop adhesion strength was found to be 8.5 kPa, providing good adhesion to skin and no pain or residue upon application and removal from the skin. Specifically, when applying the adhesive to skin with hair, hair was not pulled out and removed from the haired skin, and there was no pain on the hairless skin.

[0051] Example 2: Gel 2 of the present invention 350 g of (A) α-dimethylvinylsiloxy-ω-dimethylhydride-terminated polydimethylsiloxane having a viscosity of 150-350 cP and 2.92 g of (B) α-dimethylvinylsiloxy-ω-n-butyl-terminated polydimethylsiloxane having a viscosity of 80-120 cP were combined in a 300 GRAM MAX TALL Flacktek SpeedMixer cup and mixed by hand with a spatula. Next, 0.035 g of Karstedt's hydrosilylation catalyst (C), an α,ω-dimethylvinylsiloxy-terminated PDMS containing 3.0-3.5% Pt, was added to (A) and (B) in the cup and mixed by hand with a spatula. Then, 0.57 g of component (E), an α,ω-dimethylvinylsiloxy-terminated polydimethylsiloxane having a viscosity of 1000 cP, and 0.66 g of component (D), an α,ω-dimethylhydridosiloxy-terminated polydimethylsiloxane having a viscosity of 50 cP, were combined in a cup with the other ingredients, and the entire mixture was mixed by hand using a spatula. The mixture was then mixed in a Flacktek SpeedMixer model DAC 600.2 VAC-p centrifugal mixer at 800 rpm for 1 minute under vacuum, 35 rpm for 45 seconds, and then immediately under the same vacuum at 2350 rpm for 15 seconds. While the order listed above is preferred, components (D) and (E) may be added to each other in any order.

[0052] After curing at 100°C for 1 hour, the cured gel was analyzed by the loop adhesion test described above. The loop adhesion strength was found to be 8.3 kPa, providing good adhesion to skin and pain-free and residue-free application and removal from the skin. Specifically, when applying the adhesive to skin with hair, hair was not pulled out and removed from the hairy skin, and there was no pain on non-hairy skin.

[0053] Example 3: Gel 3 of the present invention 90.13 g of (A) α-dimethylvinylsiloxy-ω-dimethylhydride-terminated polydimethylsiloxane having a viscosity of 150-350 cP and 9.57 g of (B) α-dimethylvinylsiloxy-ω-n-butyl-terminated polydimethylsiloxane having a viscosity of 80-120 cP were combined in a 300 GRAM MAX TALL Flacktek SpeedMixer cup and mixed by hand with a spatula. Next, 0.06 g of Karstedt's hydrosilylation catalyst (C), an α,ω-dimethylvinylsiloxy-terminated PDMS containing 3.0-3.5% Pt, was added to (A) and (B) in the cup and mixed by hand with a spatula. Then, 6.43 g of component (E), an α,ω-dimethylvinylsiloxy-terminated polydimethylsiloxane having a viscosity of 1000 cP, and 3.44 g of component (D), an α,ω-dimethylhydridosiloxy-terminated polydimethylsiloxane having a viscosity of 50 cP, were combined in a cup with the other ingredients, and the entire mixture was mixed by hand using a spatula. The mixture was then mixed in a Flacktek SpeedMixer model DAC 600.2 VAC-p centrifugal mixer at 800 rpm for 1 minute under vacuum, 35 rpm for 45 seconds, and immediately thereafter at 2350 rpm under the same vacuum for 15 seconds. Although the order listed above is preferred, components (D) and (E) may be added to each other in any order.

[0054] After curing at 100°C for 1 hour, the cured gel was analyzed by the loop adhesion test described above. The loop adhesion strength was found to be 12.21 kPa, providing good adhesion to skin and pain-free and residue-free application and removal from the skin. Specifically, when applying the adhesive to skin with hair, hair was not pulled out and removed from the haired skin, and there was no pain on the hairless skin.

[0055] Example 4: Comparative Gel 1 366 g of component (E), an α,ω-dimethylvinylsiloxy-terminated polydimethylsiloxane having a viscosity of approximately 1000 cP, 0.27 g of component (G), 2-methyl-3-butyn-2-ol, and 0.035 g of Karstedt's hydrosilylation catalyst (C), were combined in a 300 GRAM MAX TALL Flacktek SpeedMixer cup. The ingredients were then mixed manually using a spatula. 31.63 g of component (D), an α,ω-dimethylhydridosiloxy-terminated polydimethylsiloxane having a viscosity of 50 cP, and 2.65 g of component (F), an α,ω-trimethyl-terminated hydridomethyl / dimethylpolysiloxane copolymer having a viscosity of 25-35 cP, were combined in the SpeedMixer cup and mixed manually using a spatula. The mixture was then mixed in a Flacktek SpeedMixer model DAC 600.2 VAC-p centrifugal mixer at 800 rpm for 1 minute under vacuum, 35 rpm for 45 seconds, followed immediately by 2350 rpm for 15 seconds under the same vacuum. While the order listed above is preferred, components (D) and (E) may be added in either order relative to each other.

[0056] After curing at 100°C for 1 hour, the cured gel was analyzed by the Loop Adhesion Test described above. The loop adhesion strength was found to be 6.2 kPa, providing good adhesion to the skin and pain-free and residue-free application and removal from the skin.

[0057] It will be appreciated that those skilled in the art could make changes to the above-described embodiments without departing from the broad inventive concept thereof. It is understood, therefore, that the invention is not limited to the particular embodiments disclosed, but will cover modifications within the spirit and scope of the invention as defined by the appended claims.

Claims

1. (a) α-dimethylvinylsiloxy-ω-dimethylhydride-terminated polydimethylsiloxane; (b) a chain terminator comprising a moiety having formula (I) and / or formula (II): 【Chemistry 1】 ;and (c) a hydrosilylation catalyst 1. A silicone gel-forming composition comprising: In the formula, R １ is a terminal alkenyl group having 2 to about 22 carbon atoms, and R ５ is a straight or branched chain alkyl group having from 1 to about 8 carbon atoms; R ６ is hydrogen or a terminal alkene having 2 to about 22 carbon atoms, and each R ２ and R ３ are independently a straight or branched chain alkyl group having 1 to about 8 carbon atoms, and o is an integer such that the viscosity of the component having formula (II) is from about 2 to about 20,000 mPas.

2. The composition of claim 1, wherein component (a) has formula (III) and a viscosity of about 50 to about 1000 mPas. 【Chemistry 2】

3. 3. The composition of claim 1, wherein component (b) is an α-dimethylvinylsiloxy-ω-n-butyl terminated polydimethylsiloxane.

4. The composition of any one of claims 1 to 3, comprising about 350 parts of component (a), about 0.5 to about 10 parts of component (b), and about 0.01 to about 1 part of component (c).

5. The composition of any one of claims 1 to 4, further comprising component (d), an α,ω-dimethylhydridosiloxy-terminated polydimethylsiloxane chain extender.

6. The method of any one of claims 1 to 5, wherein component (d) comprises a polymer having formula (IV) and has a viscosity of about 2 to about 10,000 mPas. 【Transformation 3】

7. The composition of any one of claims 1 to 6, further comprising component (e), which is an α,ω-dimethylvinylsiloxy-terminated polydimethylsiloxane.

8. The composition of any one of claims 1 to 7, wherein component (e) comprises a polymer having formula (V) and has a viscosity of from about 2 to about 10,000 mPas. 【Chemistry 4】

9. The composition of any one of claims 1 to 8, further comprising a component (f) which is a linear vinyl siloxane.

10. 10. The composition of any one of claims 1 to 9, wherein component (f) comprises a polymer having formula (VI) and has a viscosity of about 10 to about 10,000 Pas, a is about 45 to 97 mole % compared to b, and the polymer having formula (VI) has at least three silicon-bonded hydrogen atoms. 【Transformation 5】

11. The composition of any one of claims 1 to 10, further comprising at least one component (g) that is a rate control agent or rate inhibitor.

12. The composition of any one of claims 1 to 11, wherein component (g) is selected from the group consisting of 2-methyl-3-butyn-2-ol, 1-ethynyl-cyclohexanol, diallyl maleate, triallyl isocyanurate, 1,3,5,7-tetravinyl-1,3,5,7-tetramethylcyclotetrasiloxane, and triphenyl phosphite.

13. A silicone gel obtained by heating and curing the composition according to any one of claims 1 to 12.

14. (a) α-dimethylvinylsiloxy-ω-dimethylhydride-terminated polydimethylsiloxane; (b) a chain terminator comprising an alpha olefin or a siloxane containing one vinyl group or one terminal hydride group; and (c) a hydrosilylation catalyst 1. A silicone gel-forming composition comprising:

15. Component (b) is a siloxane having the formula (VII): 【Transformation 6】 15. The composition of claim 14, wherein n is an integer such that the component having formula (VII) has a viscosity of from about 2 to about 20,000 mPas.

16. A silicone gel obtained by heating and curing the composition according to claim 14 or 15.

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