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Release modifier and release coating organopolysiloxane composition

A technology of polysiloxane and polysiloxane resin, which is applied in coating, transportation and packaging, and thin material processing, etc.

Active Publication Date: 2011-06-08
DOW CORNING TORAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] The present invention aims to solve the problems indicated above

Method used

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  • Release modifier and release coating organopolysiloxane composition
  • Release modifier and release coating organopolysiloxane composition
  • Release modifier and release coating organopolysiloxane composition

Examples

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example

[0123] Hereinafter, the present invention will be specifically described using examples and comparative examples; however, the present invention is not limited to the following examples. In the following examples, parts mean parts by weight in all cases and viscosities are values ​​measured at 25°C. In each formula, M is represented by (CH 3 ) 3 SiO 1 / 2 or (CH 3 ) 2 (OH)SiO 1 / 2 Monofunctional siloxane unit represented by; M Vi Because (CH 3 ) 2 (CH 2 =CH)SiO 1 / 2 Monofunctional siloxane unit represented by; M OH by (CH 3 ) 2 (OH)SiO 1 / 2 Represented monofunctional siloxane unit; D is represented by (CH 3 ) 2 SiO 1 / 2 A difunctional siloxane unit represented by ; and Q is composed of SiO 2 Represented tetrafunctional siloxane units. The following methods were used to evaluate the curing rate of the organopolysiloxane composition forming a release coating, the adhesion of the cured coating formed from the composition to the substrate, and the performance of the cu...

Synthetic example 1

[0137] [Manufacture of peeling improver (1)]

[0138] The following materials were fed into a 2-liter separable flask equipped with a thermometer, condenser and stirrer, and stirred for 30 minutes.

[0139] (a1-1) Methyl polysiloxane resin:

[0140] m 0.74 Q 1 (OH content = 0.74%) 300g

[0141] (a2-1) Linear dimethylpolysiloxane with chain terminated by hydroxydimethylsiloxy groups at both ends of the molecular chain:

[0142] m OH D. 330 m OH 128g

[0143] Xylene 444g

[0144] After the raw materials were mixed until uniform, the temperature was raised to 40° C.; 5 g of 28% ammonia solution (a3) ​​was added; and the reaction was carried out for about 5 hours. Thereafter a water trap is installed; the temperature is raised to 140°C; condensed water and ammonia are removed over 2 hours; subsequent cooling to room temperature produces a peel modifier comprising a methylpolysiloxane resin-dimethylpolysiloxane condensate (1) xylene solution. ...

Synthetic example 2

[0147] [Manufacture of peeling improver (2)]

[0148] By producing in the same manner as the peeling modifier Synthesis Example 1, but in this case using 256 g as the component (a2-1) in Synthesis Example 1 (ie, M OH D. 330 m OH ), thereby obtaining a xylene solution of the stripping modifier (2). In addition, in order to adjust the viscosity, 556 g of linear dimethyl polysiloxane (M Vi D. 60 m Vi ) was added to the xylene solution of the stripping modifier (2). After mixing until homogeneous in about 30 minutes, xylene was removed by steam stripping to obtain a dimethyl polysiloxane solution of peel modifier (2) (peel modifier (2) content = 50% by weight).

[0149] Table 1 shows the hydroxyl group (silanol group) content of the release modifier (2). Also shown in Table 1 are the viscosities of the dimethylpolysiloxane solutions of the release modifier (2).

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Abstract

To provide a release modifier which provides a heavy release force to a cured release layer of silicone coating composition. The release modifier comprises an organopolysiloxane resin-organopolysiloxane condensation reaction product that is obtained by the condensation reaction of (a1) 100 weight parts of MQ-type organopolysiloxane resin in which the molar ratio of the M unit to the Q unit is 0.6 to 1.0 and the content of the hydroxyl group or alkoxy group is 0.3 to 2.0 weight% with (a2) 20 to 150 weight parts of chain-form diorganopolysiloxane that has an average degree of polymerization of 100 to 1000 and at least one hydroxyl group or alkoxy group; this organopolysiloxane resin-organopolysiloxane condensation reaction product preferably has a prescribed hydroxyl group content.

Description

technical field [0001] The present invention relates to a peel modifier, a peel modifier composition, an organopolysiloxane composition for forming a cured peelable coating using the peel modifier or the peel modifier composition, and an organopolysiloxane composition having A cured release-coated sheet-like substrate formed by curing this release-coat-forming organopolysiloxane composition. Background technique [0002] Organopolysiloxane compositions that form cured release coatings will be able to compare The substrate is imparted with non-adhesiveness (ie, releasability) for adhesive substances, and thus is widely used in the manufacture of pressure-sensitive adhesive tapes and various types of labels. [0003] These organopolysiloxane compositions forming cured release coatings must, inter alia, exhibit the following characteristics: the cured coating formed by curing the composition must not have a negative impact on the pressure-sensitive adhesive layer, i.e. the com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/44C09D183/04
CPCC09D183/04C08G77/44Y10T428/31663
Inventor 堀诚司山田高照郭中冕
Owner DOW CORNING TORAY CO LTD
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