Isp Investments Inc.

Isp Chemicals Inc.

Todd Elder

John J Merianos

Paul Garelick

The hydroxybenzoate compounds of this invention are defined by the formula:

Aliphatically unsaturated hydroxy benzoates and preservative compositions thereof

The antimicrobial preservative composition consisting essentially of (a) from 0.5 to 20 wt. % dihalogenated butane having terminal cyano groups and (b) from 80 to 99.5 wt. % of a heterocyclic poly(hydroxy lower alkylamide) in a weight ratio of between 0.5:2 and 0.5:25 which mixture exhibits a synergistic antimicrobial affect over each of components (a) or (b) taken individually.

Antimicrobial preservative composition

What is described is a light stable, whitish antimicrobial product which is a silver-allantoin complex encapsulated with allantoin. The molar ratio of silver-to-allantoin in the product is between 1:100 and 1:4.

Light stable antimicrobial product which is a silver-allantoin complex

A water soluble, antimicrobial composition having antifungal activity useful for disinfecting a contact lens comprise (a) polyhexamethylene biguanide and (b) iodopropynylbutyl carbamate, in a weight ratio of (a):(b) of at least 100:1.

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Rockaway, NJ, United States of America

Todd Elder