Process for preparing clustered functional polyorganosiloxanes, and methods for their use

A technology of polyorganosiloxane and process, which is applied in the preparation process and application field of clustered functional polyorganosiloxane, and can solve the problems of destroying shear thinning performance and damage

Active Publication Date: 2012-07-18
DOW SILICONES CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there is a danger of overdispersing fumed silica, which destroys silica aggregates, exposes untreated silica surfaces and destroys shear thinning properties

Method used

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  • Process for preparing clustered functional polyorganosiloxanes, and methods for their use
  • Process for preparing clustered functional polyorganosiloxanes, and methods for their use
  • Process for preparing clustered functional polyorganosiloxanes, and methods for their use

Examples

Experimental program
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Embodiment

[0211] These examples are intended to illustrate the invention to those of ordinary skill in the art and should not be construed as limiting the scope of the invention set forth in the claims. The following ingredients were used in the following examples.

[0212] Polymer a1) is a 190mm 2 / s viscosity of dimethylvinylsiloxy-terminated polydimethylsiloxane.

[0213] Polymer a2) is a dimethylvinylsiloxy-terminated polydimethylsiloxane having a viscosity of 450 mPa·s.

[0214] Polymer a3) is a dimethylvinylsiloxy-terminated polydimethylsiloxane having a viscosity of 2,000 mPa·s.

[0215] Polymer a4) is a 9,000mm 2 / s viscosity of dimethylvinylsiloxy-terminated polydimethylsiloxane.

[0216] Polymer a5) has a 55,000mm 2 / s viscosity of dimethylvinylsiloxy-terminated polydimethylsiloxane.

[0217] Polymer a6) has a 22,000mm 2 / s viscosity of phenylmethylvinylsiloxy-terminated poly(dimethyl / phenylmethylsiloxane).

[0218] Chain extender g) is a 13mm 2 A hydrogen-terminated ...

Embodiment 1

[0279] In a 1 liter glass resin pot equipped with a condenser, mechanical stirrer and thermocouple, add the following ingredients: 428.34 parts (pt) of polymer a4, 7.65 pt of SIH b2, 14.01 pt of c2) AMA and 0.05 pt of PTZ . The resulting mixture was stirred at room temperature (RT) for 10 min until the mixture was homogeneous. Thereafter, 0.09 pt of Pt catalyst was added, and the mixture was stirred at room temperature for 20 minutes. The reaction was initiated by increasing the mixer temperature to 80°C. By measuring Fourier Transform Infrared Spectroscopy (FT-IR) at 2173cm -1 The reaction was monitored by the decrease of the SiH peak at Typical reaction time is 1 hour. The reaction temperature was then cooled to 50°C, and 0.9 pt of DAM was added with stirring, and the resulting mixture was cooled to room temperature. The resulting clustered functional polyorganosiloxane had a Brookfield cone and plate viscosity of 15300 cps at 5 rpm. For compositions prepared with the ...

Embodiment 2

[0283] In a 10 liter Turrello mixer, 6515 pt of polymer a2), 401 pt of SIH b2), 900 pt of c1) ATMS and 0.89 pt of MEHQ were combined. The combination was stirred for 10 min at RT until the mixture was homogeneous. Thereafter, 1.05 pt of Pt catalyst was added, and the mixture was stirred at room temperature for 20 minutes. The reaction was initiated by increasing the mixer temperature to 100°C. By measuring 2173cm in FT-IR -1 The reaction was monitored by the decrease of the SiH peak at The reaction temperature was then cooled to 50° C., and 8.9 pt of DAM were added with stirring, and the mixture was then cooled to RT. In a dental cup, 95 pts of the resulting moisture cured clustered functional polyorganosiloxane were mixed with 3 pts of IBTMS and 2 parts PITA titanate catalyst. The resulting product had a film tack free time of 2 minutes.

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Abstract

A hydrosilylation process is used to prepare a polyorganosiloxane having clustered functional groups at the polyorganosiloxane chain terminals. The ingredients used in the process include a) a polyorganosiloxane having an average of at least 2 aliphatically unsaturated organic groups per molecule, b) a polyorganohydrogensiloxane having an average of 4 to 15 silicon atoms per molecule and at least 4 silicon bonded hydrogen atoms for each aliphatically unsaturated organic group in ingredient a), c) a reactive species having, per molecule at least 1 aliphatically unsaturated organic group and 1 or more curable groups; and d) a hydrosilylation catalyst. The resulting clustered functional polyorganosiloxane is useful in a curable silicone composition for electronics applications.

Description

[0001] Cross References to Related Applications [0002] none. [0003] background technical field [0004] The process for preparing clustered functional polyorganosiloxanes involves reacting an aliphatic unsaturated species, a species comprising silicon-bonded hydrogen atoms, and a reactive species in the presence of a hydrosilylation catalyst. The clustered functional polyorganosiloxanes prepared by this process have improved physical properties (eg, increased tensile strength and % elongation) compared to 'dumbbell' polyorganosiloxanes prepared by a different process. Clustered functional polyorganosiloxanes may contain fillers and still exhibit improved dispensing properties over 'dumbbell' polyorganosiloxanes prepared by different processes as well as improved physical properties. Background of the invention [0005] Polyorganosiloxane compositions that cure to elastomeric materials are well known. These combinations can be prepared by mixing a polydiorganosiloxane ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/50C08L83/14
CPCC08L83/14C08G77/50
Inventor S·丹特苏凯L·汤奇J·唐戈
Owner DOW SILICONES CORP
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