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block copolymer hydride

A technology of block copolymers and hydrides, which is applied in the field of block copolymer hydrides, can solve the problems of not fully improving the ease of sink marks, and achieve small sink marks, excellent heat resistance and mechanical strength Effect

Active Publication Date: 2021-10-26
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, even when the carbon-carbon unsaturated bond of the main chain and side chain of the block copolymer [C] composed of the polymer block [A] and the polymer block [B] and the carbon-carbon unsaturated bond of the aromatic ring are used, In the case of the block copolymer hydrogenated product [D] obtained by hydrogenating unsaturated carbon bonds, it should be explained that the ease of sink marks cannot be sufficiently improved when melt-molding a thick-walled optical member. Yes, the above-mentioned polymer block [A] has a structural unit derived from an aromatic vinyl compound as a main component, and the above-mentioned polymer block [B] has a structural unit derived from a chain conjugated diene compound as a main component of

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] [Example 1] Hydrogenated block copolymer [D1]

[0107] (1) Production of block copolymer [C1]

[0108]270 parts of dehydrated cyclohexane, 8 parts of dehydrated styrene, and 1.1 parts of dibutyl ether were charged into a reactor equipped with a stirring device and sufficiently replaced with nitrogen inside. While stirring the entire contents at 60°C, 0.82 parts of n-butyllithium (15% cyclohexane solution) was added to initiate polymerization. Continue to stir the entire contents at 60°C for 20 minutes.

[0109] At this point (the first stage of polymerization), the reaction solution was analyzed using gas chromatography (hereinafter, sometimes referred to as "GC") and GPC. As a result, the polymerization conversion rate was 99.5%, Mw was 4200, and Mw / Mn is 1.01.

[0110] Next, 15 parts of dehydrated isoprene was continuously added to the reaction liquid over 40 minutes, and stirring was continued for 30 minutes after the addition was terminated.

[0111] At this poi...

Embodiment 2

[0132] [Example 2] Block copolymer hydrogenated product [D2]

[0133] (1) Production of block copolymer [C2]

[0134] In the first stage of polymerization, make 7 parts of dehydrated styrene, and make 0.78 parts of n-butyllithium (15% cyclohexane solution); in the second stage of polymerization, make 20 parts of dehydrated isoprene; In three stages, except having made 73 parts of dehydrated styrene, it carried out similarly to Example 1, and obtained the polymer solution containing the block copolymer [C2] of [A1]-[B]-[A2] type.

[0135] (2) Production of hydrogenated block copolymer [D2]

[0136] Using the above-mentioned polymer solution, it carried out similarly to Example 1, and produced the particle|grains of 94 parts of hydrogenated block copolymers [D2].

[0137] Mw[A1], Mw[A2], and wA:wB values ​​of the block copolymer [C2] and Mw[D2], hydrogenation rate, and Tg of the hydrogenated block copolymer [D2] 2 The values ​​are listed in Table 1.

[0138] (Lens molding an...

Embodiment 3

[0140] [Example 3] Block copolymer hydrogenated product [D3]

[0141] (1) Production of block copolymer [C3]

[0142] In the first stage of polymerization, make 8 parts of dehydrated styrene, and make 0.72 parts of n-butyllithium (15% cyclohexane solution); in the second stage of polymerization, make 25 parts of dehydrated isoprene; In three stages, except having made 67 parts of dehydrated styrene, it carried out similarly to Example 1, and obtained the polymer solution containing the block copolymer [C3] of [A1]-[B]-[A2] type.

[0143] (2) Production of hydrogenated block copolymer [D3]

[0144] Using the above-mentioned polymer solution, it carried out similarly to Example 1, and produced the particle|grains of 96 parts of hydrogenated block copolymers [D3].

[0145] The values ​​of Mw[A1], Mw[A2] and wA:wB of the block copolymer [C3] and the Mw[D3], hydrogenation rate, and Tg of the hydrogenated block copolymer [D3] were calculated. 2 The values ​​are listed in Table 1....

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Abstract

The present invention provides a new hydrogenated block copolymer [D], which is beneficial to the molding of thick-walled optical members with small sink marks by maintaining heat resistance and mechanical strength and improving fluidity during melting A hydrogenated block copolymer, the above-mentioned hydrogenated block copolymer [D] is obtained by hydrogenating a block copolymer [C] composed of two polymer blocks [A] and one polymer block B The above-mentioned polymer block [A] has a structural unit derived from an aromatic vinyl compound as a main component, and the above-mentioned polymer block [B] has a structural unit derived from a chain-like conjugated diene compound as a main component. Among polymer blocks [A], when a block with a small molecular weight is used as a polymer block [A1] and a block with a large molecular weight is used as a polymer block [A2], the polymer block The molecular weights of [A1] and polymer block [A2] are within specific ranges.

Description

technical field [0001] The present invention relates to hydrogenated block copolymers, in particular to novel hydrogenated block copolymers having an alicyclic structure. Background technique [0002] In optical components such as optical lenses, prisms, mirrors, and optical discs, ring-opening metathesis polymer hydrogenated products obtained by ring-opening polymerization and hydrogenation of norbornene-based cyclic olefins, cyclic olefins, and ethylene, etc. Copolymers are widely used because of their properties such as transparency, heat resistance, low hygroscopicity, and low birefringence. [0003] On the other hand, Patent Documents 1 and 2 disclose a hydrogenated aromatic vinyl compound copolymer in which the aromatic ring of the aromatic vinyl compound polymer is hydrogenated, and a block copolymer [C] derived from the aromatic ring and conjugated The hydrogenated block copolymer [D] in which the double bond of the diene compound is hydrogenated has excellent light...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/04C08F297/04C08K5/134
CPCC08F8/04C08F297/04C08K5/1345C08F2810/50
Inventor 栗原龙太小原祯二
Owner ZEON CORP