摘要:
The present invention relates to resin useful in preparing plastic lenses having a high refractive index comprising reacting an aliphatic polyisocyanate compounds having at least one sulfur atom with one or more of active hydrogen compounds selected from the group consisting of a polyol, a polythiol having sulfur atoms only in a mercapto groups, and a polythiol having at least one sulfur atom other than in the mercapto groups; lenses containing the above-mentioned resin; and a method for the preparation thereof characterized by adding an internal release agent to the mixture of the above-mentioned raw materials in casting lenses from the resin; and lenses obtained by this method.
摘要:
A process for producing a plastic lens having a high refractive index and profile regularity which includes forming a mixture of one or more of sulfur-containing aromatic polyisocyanate compounds, one or more of active hydrogen compounds selected from the group consisting of polyol compounds and polythiol compounds, and at least one internal mold releasing agent. Then subjecting the resulting mixture to casting polymerization, to form the plastic lens.
摘要:
Polyurethane base lens resins obtained by reacting one or more of sulfur-containing polyisocyanates compound with one or more of sulfur-containing polyols, and polyurethane base lenses comprising these resins are disclosed.A method for preparing polyurethane base lenses which comprises adding internal mold releasing agents to the mixture of the above polyisocyanates and polyols prior to casting polymerization is also disclosed.
摘要:
The present invention discloses a composition for high refractive index plastic lens consisting of a monomer mixture wherein a particular aliphatic thiol compound is added to a polyisocyanate represented by general formula (1): ##STR1## wherein each X represents a hydrogen atom or a methyl group; each R represents a chlorine atom, a bromine atom, a methyl group or an ethyl group; m represents an integer of 0-4; and n represents an integer of 2-4, and a polythiol of formula (2): ##STR2## and a high refractive index plastic lens made of a urethane-containing resin obtained by polymerizing said composition.
摘要:
A mercapto compound represented by the following formula (1): ##STR1## is obtained by reacting, in the presence of a mineral acid, thiourea with a compound represented by the following formula (2): wherein X means a hydroxyl group or a chlorine or bromine atom, and then adding a base to alkalinize the reaction mixture so that the reaction product is hydrolyzed.The mercapto compound represented by the formula (1) can be reacted with at least one cyanate compound selected from the group consisting of polyisocyanate compounds, polyisothiocyanate compounds and isocyanate-group-containing isothiocyanate compounds to form a sulfur-containing urethane resin lens made of the resin is colorless and transparent, has high refractive index and low dispersion characteristics, and is excellent especially in heat resistance.
摘要:
The present invention relates to a process for producing a plastic lens having a high refractive index and profile regularity comprising forming a mixture of one or more of sulfur-containing aromatic polyisocyanate compounds, one or more of active hydrogen compounds selected from the group consisting of polyol compounds and polythiol compounds, and at least one internal mold releasing agent, and subjecting the resulting mixture to casting polymerization, and a plastic lens obtained according to the process.
摘要:
Disclosed herein are a novel and highly refractive S-alkyl thiocarbamate base resin useful in preparing lenses and a process for producing the resin comprising reacting one or more of polyisocyanate compounds and one or more of mercapto compound having at least one hydroxyl group, a plastic lens made of the resin, and a process for making a plastic lens of high profile regularity from the resin by using internal mold releasing agents in the casting polymerization process.
摘要:
Metal complexes of halogen-substituted o-benzenedithiols of the general formula: ##STR1## wherein X represents a chlorine or bromine atom, Y and Z represent each a hydrogen or chlorine atom when X is a chlorine atom or they represent each a hydrogen or bromine atom when X is a bromine atom, M represents a nickel, palladium or platinum atom, and A represents a quaternary ammonium group, are provided.These metal complexes have a high compatibility with resins and are useful as near infrared absorbers. Halogen-substituted o-benzenedithiols of the formula: ##STR2## wherein X, Y and Z have the same meaning as above; used as starting materials for the above metal complexes are also new compounds.
摘要:
Disclosed herein are a resin for high-refractivity lenses, formed by copolymerizing at least one unifunctional monomer selected from the group of compounds represented by the following general formula (I); ##STR1## wherein X means a oxygen or sulfur atom, Y denotes a chlorine or bromine atom, R is a hydrogen atom or a methyl group, m is 0 or 1 and n stands for an integer of 1-5 with at least one bifunctional monomer selected from the group of compounds represented by the following general formula (II); ##STR2## wherein Z is a hydrogen, chlorine or bromine atom, R means a hydrogen atom or a methyl group and p stands for an integer 1-4 as well as high-refractivity lenses made of such a resin. The lens-making resin according to this invention features a high refractive index, excellent processability such as superb grinding processability and high impact resistance, especial outstanding miscibility between the unifunctional monomer and bifunctional monomer upon copolymerization thereof, owing to the similarity of the molecular structure between the unifunctional monomer and the bifunctional monomer. Accordingly, it barely results in development of polymerization strain upon copolymerization thereof.
摘要:
Disclosed herein are a resin for high-refractivity lenses, formed by copolymerizing at least one nucleus-halogenated benzene dicarboxylate represented by the following general formula (I): ##STR1## wherein X means a chlorine or bromine atom, n is 2 or 4, m stands for 0 or 1 and R denotes a hydrogen atom or a methyl group with at least one unifunctional monomer having a refractive index of at least 1.55 as a homopolymer, capable of undergoing a radical polymerization and containing an aromatic ring as well as high-refractivity lenses made of such a resin. The lens-making resin according to this invention features a high refractive index, excellent processability such as superb grinding processability and high impact resistance, outstanding miscibility between the unifunctional monomer and bifunctional monomer upon copolymerization thereof, and minimized polymerization strain.