EP0322663A2 — Process for producing styrene-based polymers and …

Claim 1

Independent Claim 73 words

A process for producing styrene-based polymers having mainly syndiotactic configuration in the presence of a catalyst comprising (A) a titanium compound and (B) a contact product of a methyl group-containing organoaluminum compound and water, wherein the contact product (B) has a high magnetic field component of not more than 50% in the methyl proton signal region due to an aluminum-mehtyl group (Al-CH₃) bond as determined by the proton nuclear magnetic resonance absorption method.

Claim 2

Dependent Claim 73 words

A process for producing styrene-based polymers having mainly syndiotactic configuration in the presence of a catalyst comprising (A) a titanium compound and (B) a contact product of a methyl group-containing organoaluminum compound and water, wherein the contact product (B) has a high magnetic field component of not more than 50% in the methyl proton signal region due to an aluminum-mehtyl group (Al-CH₃) bond as determined by the proton nuclear magnetic resonance absorption method.

Claim 3

Dependent Claim 60 words

The process as claimed in Claim 1 wherein the high magnetic component in the methyl proton signal region due to the aluminum-methyl group (Al-CH₃) bond as determined by the proton nuclear magnetic resonance absorption method is in the range of -0.1 to -0.5 ppm with the methyl proton (2.35 ppm) of toluene under toluene solvent measuring conditions as the standard.

Claim 4

Dependent Claim 30 words

The process as claimed in Claim 1 wherein the contact product (B) has a molecular weight of 400 to 3,000 as determined by the freezing point depression method using benzene.

Claim 5

Dependent Claim 18 words

The process as claimed in Claim 1 wherein the contact product (B) is further subjected to heat treatment.

Claim 6

Dependent Claim 42 words

The process as claimed in Claim 1 wherein the contact product (B) is a contact product of trimethylaluminum and tri-branched alkylaluminum represented by the general formula: AlR₃ (wherein R is a branched alkyl group having 3 to 10 carbon atoms) with water.

Claim 7

Dependent Claim 161 words

The process as claimed in Claim 1 wherein the titanium compound (A) is at least one compound selected from the group consisting of titanium compounds and titanium chelate compounds represented by the general formula: TiR¹ a R² b R³ c R⁴ 4-(a+b+c) or TiR¹ d R² e R³ 3-(d+e) (wherein R¹, R², R³ and R⁴ are independently a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkoxy group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an alkylaryl group having 6 to 20 carbon atoms, an arylalkyl group having 6 to 20 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, an acyloxy group having 1 to 20 carbon atoms, a cyclopentadienyl group, a substituted cyclopentadienyl group, an indenyl group or a halogen atom, a, b and c are independently an integer of 0 to 4, and d and e are independently an integer of 0 to 3).

Claim 8

Dependent Claim 32 words

The process as claimed in Claim 1 wherein the catalyst comprises (A) a titanium compound, (B) a contact product of a methyl group-containing organoaluminum compound and water, and (C) an organoaluminum compound.

Claim 9

Dependent Claim 63 words

A catalyst for producing styrene-based polymers, comprising (A) a titanium compound and (B) a contact product of a methyl group-containing organoaluminum compound and water, wherein the contact product (B) has a high magnetic field component of not more than 50% in the methyl proton signal region due to an aluminum-methyl group (Al-CH₃) bond as determined by the proton nuclear magnetic resonance absorption method.

Claim 10

Dependent Claim 63 words

A catalyst for producing styrene-based polymers, comprising (A) a titanium compound and (B) a contact product of a methyl group-containing organoaluminum compound and water, wherein the contact product (B) has a high magnetic field component of not more than 50% in the methyl proton signal region due to an aluminum-methyl group (Al-CH₃) bond as determined by the proton nuclear magnetic resonance absorption method.

Claim 11

Dependent Claim 65 words

A catalyst for producing styrene-based polymers, comprising (A) a titanium compound, (B) a contact product of a methyl group-containing organoaluminum compound and water, said contact product having a high magnetic field component of not more than 50% in the methyl proton signal region due to an aluminum-methyl group (Al-CH₃) bond as determined by the proton nuclear magnetic resonance absorption method, and (C) an organoaluminum compound.

Claim 12

Dependent Claim 65 words

A catalyst for producing styrene-based polymers, comprising (A) a titanium compound, (B) a contact product of a methyl group-containing organoaluminum compound and water, said contact product having a high magnetic field component of not more than 50% in the methyl proton signal region due to an aluminum-methyl group (Al-CH₃) bond as determined by the proton nuclear magnetic resonance absorption method, and (C) an organoaluminum compound.

Process for producing styrene-based polymers and catalyst for use therein

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