Dip-forming synthetic isoprene polymer latex, dip-forming composition, and dip-formed article
AssigneeZeon Corporation
InventorYoshiyuki Nakamura
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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.
Claims10
A dip-forming synthetic isoprene polymer latex comprising a synthetic isoprene polymer obtained by solution polymerization using an alkyllithium polymerization catalyst, wherein
- a weight average molecular weight of the synthetic isoprene polymer is from 800,000 to 1,760,000,
- 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,
- the latex is obtained by emulsifying in water a solution or a fine suspension of the synthetic isoprene polymer in an organic solvent in the presence of a surfactant,
- a pH of the latex is from 7 to 12, and
- a Brookfield viscosity difference (V66−V56) between a Brookfield viscosity of the latex containing the synthetic isoprene polymer at a solid content concentration of 56% (V56) and a Brookfield viscosity of the latex containing the same synthetic isoprene polymer at a solid content concentration of 66% (V66) is 200 mPa·s or less,
- wherein (V56) and (V66) are each measured using a Brookfield viscometer at a liquid temperature of 25° C.
Dependencies are inferred from the claim text.