Acrylic rubber excellent in storage stability
AssigneeZeon Corporation
InventorsHirofumi MASUDA, Takafumi KAWANAKA
Life of this patent
Estimating the term…
Abstract
An acrylic rubber, including: 50 to 99.9% by weight of a bond unit derived from at least one (meth) acrylic acid ester selected from the group consisting of (meth) acrylic acid alkyl ester and (meth) acrylic acid alkoxyalkyl ester; 0.1 to 20% by weight of a bond unit derived from a monomer containing a reactive group; and 0 to 30% by weight of a bond unit derived from other monomer, wherein the acrylic rubber contains a phenolic anti-aging agent represented by a general formula (1), (R1 represents an isopropyl group or a t-butyl group, and R2 represents an alkyl group having 1 to 12 carbon atoms), and the weight average molecular weight (Mw) of the acrylic rubber is in the range of 100,000 to 5,000,000.
Claims26
An acrylic rubber, comprising:
- 50 to 99.9% by weight of a bond unit derived from at least one (meth) acrylic acid ester selected from the group consisting of (meth) acrylic acid alkyl ester and (meth) acrylic acid alkoxyalkyl ester;
- 0.1 to 20% by weight of a bond unit derived from a monomer containing a reactive group;
- and
- 0 to 30% by weight of a bond unit derived from other monomer, wherein
- the acrylic rubber contains a phenolic anti-aging agent represented by a general formula (1),
- (R1 represents an isopropyl group or a t-butyl group, and R2 represents an alkyl group having 1 to 12 carbon atoms), and the weight average molecular weight (Mw) of the acrylic rubber is in the range of 100,000 to 5,000,000.
A method for producing an acrylic rubber by:
- emulsifying a monomer component containing at least one (meth) acrylic acid ester selected from the group consisting of (meth) acrylic acid alkyl ester and (meth) acrylic acid alkoxyalkyl ester, a monomer containing a reactive group, and other copolymerizable monomers as required, with water and an emulsifier, to obtain an emulsion polymerization liquid emulsion-polymerized under the presence of a polymerization catalyst;
- and
- adding a phenolic anti-aging agent represented by a general formula (1),
- (R1 represents an isopropyl group or a t-butyl group, and R2 represents an alkyl group having 1 to 12 carbon atoms) to the obtained emulsion polymerization liquid;
- and thereafter coagulating and drying.
Dependencies are inferred from the claim text.