摘要:
A plastic lens having a refractive index of not less than 1.55, comprising a polymer formed from dimethallyl phthalate as major monomeric constituent and, if necessary, one or more monomers represented by the general formula wherein R 1 and R 2 represent each a hydrogen atom or methyl group and m and n represent each an integer of from 0 to 3, or wherein R 3 and R 4 represent each a hydrogen atom or methyl group and n represents an integer of from 2 to 9. A method for manufacturing such a lens is also disclosed.
摘要:
High solids content aqueous vinyl acetate emulsions having long term stability are provided by polymerizing vinyl acetate in the presence of a surfactant of the formula wherein:
R, is an alkyl group having from 6 to 18 carbons; R 2 is H or an alkyl group having from 6 to 12 carbons; n is greater than 9; and
Me is a monovalent cation selected from the group consisting of NH., Na, Li and K, and water. The quantity of water is predetermined so as to produce a latex having at least 40% solids. Also the production of these emulsions and the stated surfactants are object of the invention.
摘要:
Polymerizable monomeric carbamates are disclosed. Polymers comprising recurring units from such carbamates undergo β-elimination in an alkaline environment and are useful in diffusion control layers in diffusion transfer photographic products.
摘要:
Procédé pour la préparation de dispersions aqueuses ainsi que de copolymérisation d'émulsions d'halogénures vinyliques et/ou d'esters de vinyle et le cas échéant d'autres monomères, sous la présence d'émulgateurs. Pour stabiliser les dispersions obtenues, on ajoute au début de la polymérisation des colloïdes de protection. Les dispersions, à teneur en solides élevées ont des petites viscosités et une viscosité structurelle basse. Elles sont appropriées pour la préparation de poudres pouvant être de nouveau dispersées.
摘要:
Disclosed is a uniform, colored composition of monomeric polyol(allyl carbonate), a viscosity increasing polymer, and dispersed colorant. Also disclosed is a uniform, colored polymerizate of the composition and a method of preparing the uniform, colored polymerizate. In a preferred exemplification the polymerizate is neutral density gray, and the colorant is carbon black.
摘要:
A liquid composition comprising a polyol(allyl carbonate), a photochromic agent, and a first peroxide polymerization initiator characterized in that a second peroxide polymerization initiator is present, the second initiator having a half life at least five times greater than the first, measured atthe same temperature, in polyol(allyl carbonate) and a method of polymerizing a polyol(allyl carbonate) having a photochromic agent incorporated therein by adding a first peroxide polymerization initiator to the polyol(allyl carbonate) monomer and curing the polyol(allyl carbonate), characterised in that a second peroxide polymerization initiator is added to the polyol(allyl carbonate), the second initiator having a half life at least five times greaterthan the first, measured at the same temperature, in polyol(allyl carbonate).
摘要:
Procédé de préparation de latex de polymères de 'acétate de vinyle consistant à polymériser en émulsion iqueuse de l'acétate de vinyle seul ou en mélange avec au moins un monomère copolymérisable en présence d'un initiateur, d'un émulsifiant et d'un colloïde pro- :ecteur constitué d'un polymère soluble dans l'eau des imides des acides acrylique et méthacrylique et de leurs dérivés N-alkylés substituées ou non, e d'un polymère i'éthylène glycol, de masse moléculaire comprise entre 1000 et 50000, soluble dans l'eau. Application des latex comme liants dans la fabri- cation des peintures, colles, papiers, textiles, revête- nents de soi, additifs pour mortiers.