# US 2018/0022841 A1 · Dip-forming synthetic isoprene polymer latex, dip-forming composition, and dip-formed article

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- Number: US 2018/0022841 A1
- Document ID: US20180022841A1
- Status: Published application
- Kind: A1
- Application number: 15/546,597
- Filed: 2016-02-15
- Published: 2018-01-25
- Earliest claimed: 2015-03-03
- Assignees: Zeon Corporation
- Applicants: Zeon Corporation
- Inventors: Yoshiyuki NAKAMURA
- Web page: https://patentgrep.com/patent/US20180022841A1

## CPC

- C08F 36/08: Isoprene
- B29C 41/14: Dipping a core {(B29C41/10 takes precedence)}
- C08J 3/05: from solid polymers
- C08J 3/07: from polymer solutions
- C08K 3/30: Sulfur-, selenium- or tellurium-containing compounds
- C08K 5/0025: {Crosslinking or vulcanising agents; including accelerators}
- C08K 5/36: Sulfur-, selenium-, or tellurium-containing compounds {(C08K5/0091 takes precedence)}
- C08L 9/10: Latex (C08L9/04, C08L9/08 take precedence)
- B29K 2007/00: Use of natural rubber as moulding material
- C08J 2309/00: Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS

## Abstract

A dip-forming synthetic isoprene polymer latex contains a synthetic isoprene polymer which has been subjected to solution polymerization using an alkyllithium polymerization catalyst. A ratio between a mode diameter and a median diameter (mode diameter/median diameter) of a particle diameter of the latex is 0.8 or more. A Brookfield viscosity difference (V66−V56) between a Brookfield viscosity at a solid content concentration of 56% (V56) and a Brookfield viscosity at a solid content concentration of 66% (V66) is 200 mPa·s or less.

## Claims

### Claim 1

A dip-forming synthetic isoprene polymer latex comprising a synthetic isoprene polymer obtained by solution polymerization using an alkyllithium polymerization catalyst, wherein
a ratio between a mode diameter and a median diameter (mode diameter/median diameter) of a particle diameter of the latex is 0.8 or more, and
a Brookfield viscosity difference (V66−V56) between a Brookfield viscosity at a solid content concentration of 56% (V56) and a Brookfield viscosity at a solid content concentration of 66% (V66) is 200 mPa·s or less.

### Claim 2 (depends on 1)

A dip-forming composition comprising the dip-forming synthetic isoprene polymer latex according to claim 1, a sulfur-based vulcanizing agent, and a vulcanization accelerator.

### Claim 3 (depends on 2)

A dip-formed article obtained by dip-forming the dip-forming composition according to claim 2.