A process for producing a polymerizable composition for an optical material of the present invention includes a step of mixing (A) at least one kind of thiol compound having at least two mercapto groups, (B) a tin compound represented by general formula (1), and (C) at least one kind of isocyanate compound having at least two isocyanato groups, in which the polymerizable composition for an optical material obtained in the above step has a haze value of 0.05 or less.

(R.sup.4).sub.cSnX.sub.4c (1)

The object of the present invention is to provide a highly crystalline polyethylene-2,6-naphthalate composition by achieving high molecular weight of PEN, wherein the polyethylene-2,6-naphthalate composition has greatly improved blow moldability and provides molded products having excellent hue, excellent weathering resistance, and additionally excellent transparency. The above-mentioned problems can be solved by a polyethylene-2,6-naphthalate composition comprising a specific phosphoric acid which is a phosphorus compound, cobalt element derived from a cobalt compound, manganese element derived from a manganese compound, and antimony element derived from an antimony compound, wherein the content of each of the elements simultaneously satisfies the following expressions (1) to (4):
10Co30 mmol %(1)
0.50P/Mn1.28(2)
10Sb25 mmol %(3)
0.60IV1.50 dL/g(4).

Provided is a method of preparing a transparent, non-elastomeric optical article including (1) combining to form a reaction mixture free of urethanation catalysts (a) a polyisocyanate component; and (b) an active hydrogen component of polyol and/or polythiol, and at least one compound containing both amine and hydroxyl functional groups; (2) allowing the polyisocyanate component to react with amine functional groups in the active hydrogen component to form an intermediate product including a polyurea prepolymer having hydroxyl functional groups in admixture with the polyol and/or polythiol and, optionally, the compound containing both amine and hydroxyl functional groups; (3) mixing the intermediate product with additional polyisocyanates and optionally a urethanation catalyst to form a second reaction mixture; (4) introducing the second reaction mixture to a mold to form a thermoset polymerizate; and (5) releasing the polymerizate from the mold. Optical films and articles prepared by the method also are provided.

The present disclosure relates to pyrrolidine-based catalysts for use in a polyurethane formulation. The polyurethane formulation includes the pyrrolidine-based catalyst, a compound containing an isocyanate functional group, an active hydrogen-containing compound. The use of such catalysts produces high quality polyurethane foam while reducing environmental concerns that can arise during the production of polyurethane foam as well as in the foam that is produced.

The invention is directed to a polymer composition comprising 60 to 85 parts by weight of a thermoplastic polyurethane; and 15 to 40 parts by weight of a polyolefin, where the parts by weight of the thermoplastic polyurethane and parts by weight of the polyolefin add up to 100 parts by weight; and further comprising 1 to 15 parts by weight of a hydrogenated block copolymer derived from a vinyl aromatic monomer and a conjugated diene monomer, based on 100 parts by weight as a total amount of the thermoplastic polyurethane and polyolefin. The invention is further directed to a molded article based on the polymer composition.

A process for producing an optical material of the present invention includes a step of mixing di- or higher-functional thiol compounds (A) having one or more sulfide bonds and/or one or more ester bonds with an imidazole-based curing catalyst (B) to prepare a mixed solution; a step of mixing the mixed solution with an isocyanate compound (C) including at least one kind of a di- or higher-functional alicyclic isocyanate compound (c1) and/or a di- or higher-functional aliphatic isocyanate compound (c2) to prepare a polymerizable composition for optical materials; a step of injecting the polymerizable composition for optical materials into a mold; and a step of polymerization-curing the polymerizable composition for optical materials in the mold.

Hot melt adhesive including a randomly hydroxyl functionalized branched olefin copolymer has: number average molecular weight between 10 to 50 kg/mol, crystallinity content below 30%, enthalpy between 5 to 65 J/g, polydispersity index from 2 to 6, melting temperature between 40 and 120 C., optionally, more than two hydroxyl functionalities per polymer chain and consisting of at least 80 mol % of a unit of formula (1), optionally a unit of formula (2), and between 0.1 to 1 mol %, of a unit of formula (3):

##STR00001## wherein: R.sup.1 is H or CH.sub.3; R.sup.2 is a C.sub.0-10 hydrocarbyl group; R.sup.3 is a C.sub.2-10 hydrocarbyl group, and the hydroxyl functionalized olefin copolymer has undergone an addition reaction with a di-, tri-or polyisocyanates of formula (4):

OCNR.sup.4NCO).sub.n Wherein, R.sup.4 is a C.sub.1-10 hydrocarbyl group.

A steering wheel for a vehicle is provided which comprises a steering wheel rim, a hub base and at least one spoke, wherein the hub base is arranged inside the steering wheel rim and the hub base is connected to the steering wheel rim by the at least one spoke. The steering wheel is formed from a rigid, injection molded thermoplastic polyurethane material.

Provided is a transparent, non-elastomeric optical article prepared by (1) combining to form a reaction mixture (a) a polyisocyanate component; and (b) an active hydrogen component including (b1) a first component free of amino groups including at least one first polyol; and (b2) a second component containing (i) a second polyol and/or a polythiol and (ii) a compound containing both amine and hydroxyl functional groups; (2) introducing the reaction mixture to a mold at a temperature and for a time sufficient to form a thermoset polymerizate; and (3) releasing the polymerizate from the mold to yield a transparent, non-elastomeric optical article. Also provided is a method for preparing a transparent optical film. Optical films and articles prepared by the methods also are provided.

The present invention provides a thermoplastic polyurethane composition for injection molding and a method of manufacturing the same. The thermoplastic polyurethane composition for injection molding can be easily injection-molded since a slip property is imparted to a soft segment, and can possess excellent durability properties such as heat-aging resistance, photoaging resistance, and wear resistance, and stability properties such as airbag deployment performance and anti-fogging property, as well as excellent tactile sensation and embossing quality, when a chain extender and a multifunctional polydimethylsiloxane-based compound are mixed with an isocyanate- and ether-containing polyester polyol, and can be useful in simplifying processes, reducing manufacturing costs, and simplifying facilities due to a decrease in the number of parts when molded articles are manufactured using the composition.