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Ultraviolet-curable organopolysiloxane gel composition for optical pickup

A polysiloxane, pick-up technology, applied in the direction of recording/reproducing by optical methods, optical recording heads, instruments, etc., can solve the problem of poor curability, reduced curability of the composition, and uneven progress etc.

Inactive Publication Date: 2007-09-19
SHIN ETSU CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the ultraviolet radiation intensity (light intensity on the irradiated area) increases, the curability of the composition decreases, and the physical properties of the obtained cured product become poor, and due to the Curability also deteriorates, and if the composition is cured to obtain a thick object, curing from the surface of the object to the deep part does not proceed uniformly

Method used

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  • Ultraviolet-curable organopolysiloxane gel composition for optical pickup
  • Ultraviolet-curable organopolysiloxane gel composition for optical pickup
  • Ultraviolet-curable organopolysiloxane gel composition for optical pickup

Examples

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Embodiment 1 to 3

[0142] (embodiments 1 to 3, comparative examples 1 to 3)

[0143]In Examples 1 to 3 and Comparative Examples 1 to 3, ultraviolet curable organopolysiloxane compositions were prepared by adding a photoinitiator (2-hydroxy-2- Methyl-1-phenylpropan-1-ol) was added to 100 parts of polysiloxane A or polysiloxane B obtained in the above synthesis example. Then by using ultraviolet radiation equipment ASE-20 (a product name, produced by Japan Storage Battery Co., Ltd.) using 4.5J / cm 2 UV radiation converted each composition into a gel. The penetration of the obtained gel, the curability of the deep part, and the curability as a function of the intensity of ultraviolet radiation were measured by the methods described below. The results are shown in Table 1. In this table, "parts" means "parts by mass".

[0144] [Penetration value]

[0145] A sample of 18.0 grams of each composition shown in Table 1 was placed in a glass Petri dish (40mmΦ×20mmH), and the composition was cured unde...

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Abstract

An ultraviolet-curing organic polysiloxane gel composition is provided, which shows a good curing performance for various ultraviolet radialization strengths and provides good curing performance at a deep-seated portion, and a damping material used in an optical pickup is also provided. The ultraviolet-curing organic polysiloxane gel composition comprising (A) organic polysiloxane (A-0) of 100 parts by weight, which contains organic polysiloxane (A-1) containing a group represented by a general formula (I), (wherein, R1 represents hydrogen atom or methyl group, R2 to R7 represent hydrogen atom or unsubstituted or substituted univalent alkyl, a represents an integer of 1 to 3, and b represents an integer of 1 or 2), or a mixture of the organic polysiloxane (A-1) and organic polysiloxane (A-2) free of the group represented by the general formula (I), wherein the group represented by the general formula (I) in each molecule of the organic polysiloxane (A) has an arithmetic average in a range of 0.3-1.6, and (B) a Photoinitiator of 0.01-10 parts by weight, and a damping material used in an optical pickup and containing a curing product of the composition, are provided.

Description

technical field [0001] The present invention relates to an ultraviolet curable organopolysiloxane gel composition for an optical pickup, and to a damping material for an optical pickup obtained by curing the composition. More particularly, the present invention relates to a material for a damping material of an optical pickup provided in an optical recording and / or audio playback device or the like. Background technique [0002] Organopolysiloxane gels have a low modulus of elasticity and exhibit strong adhesive strength, and are therefore used in many fields including filling of hybrid ICs, filling materials for various electric or electronic parts, Sealants, coating materials and adhesives, and as damping materials for devices such as optical pickups. [0003] However, these organopolysiloxanes are generally obtained by means of so-called addition reaction-curable organopolysiloxane compositions by means of aliphatic unsaturated groups attached to silicon atoms in the pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/14G11B7/12G11B7/13
CPCC08J3/02C08L83/04G11B7/13
Inventor 岩田充弘小材利之
Owner SHIN ETSU CHEM IND CO LTD
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