摘要:
Disclosed are methods of forming foam comprising: (a) providing a foamable composition comprising an isocyanate, a polyol and a physical blowing agent comprising at least about 50% by weight of trans1233zd and wherein the polyol comprises a polyol or mixture of polyols such that the trans1233zd(E) has a solubility in said polyol of 20 pphp or less and (b) forming a foam from said foamable composition.
摘要:
A polymeric radiation-source with customized geometries to maximize receipt of radiation into treatment areas that is formed from either radioisotopes molecularly bonded to a polymer or radioisotopes encased within a polymer.
摘要:
1) Polyurethane composition comprising: a) at least 98% by weight of at least one non-hot-melt polyurethane bearing NCO end groups based on diphenyl methane diisocyanates (MDI), b) a MDI monomer content of less than or equal to 1% by weight, c) at least one particular isocyanate compound with a molar volume of less than or equal to 300 millilitres per mole. 2) Process for preparing a polyurethane composition as defined previously, and an adhesive, mastic and/or surface coating composition formulated from such a polyurethane composition.
摘要:
A polymeric radiation-source with customized geometries to maximize receipt of radiation into treatment areas that is formed from either radioisotopes molecularly bonded to a polymer or radioisotopes encased within a polymer.
摘要:
“MICROFIBER INTRODUCED IN RIGID FOAM COMPOSED OF POLYURETHANE AND POLYISOCYANURATE APPLIED ON THERMAL INSULATOR PRODUCT”, composed by polyurethane and polyisocyanurate in low or high density(2), with introduction of microfibers(3) introduced more directly into the insulating core of the shaped product, type roof tiles and covers(4) of buildings, in order to increase the mechanic resistance of rigid foam structures composed of polyurethane and polyisocyanurate in low and high density, mainly, in low density, enabling a mechanically stronger and much lighter structure for its handling and installation.
摘要:
The present invention relates to novel liquid hardeners for hardening hardenable polymer resins, particularly epoxide resins, and epoxide resin compositions and to the use thereof for producing composite fiber materials.
摘要:
A compound having the formula: X−N+(CH3)(CH2CH2OH)2[(CH2)n—COO—R1] and a polymer having the repeat unit: X−{—OCH2CH2—N+(CH3)[(CH2)n—CO—Y]—CH2CH2O—CO—NH—R2—NH—CO—}. R1 is an ester protecting group, R2 is an organic group, X is a halide, and n is a positive integer. Each Y is O−Z+ or O—R1, where Z+ is a cation from an aqueous base. A method of reacting N-methyldiethanolamine with an ω-halo-n-alkanoate ester to form the above compound.
摘要:
The invention relates to a method for functionalizing a thermoset, crosslinked isocyanate-based polymeric solid material which is made of isocyanate and isocyanate reactive components, at least one of which comprises an anchor component which has at least one anchor group. The anchor groups on the solid material are formed by terminal alkene and/or alkyne groups. To functionalize this polymeric solid material it is brought in contact with a solution which contains at least one functional component. This functional component comprises at least one thiol group and is allowed to bind covalently to the polymeric solid material by a free-radical addition reaction between the thiol groups on the functional component and the terminal alkene and/or alkyne anchor groups on the undissolved solid material. An effective functionalization of the polymeric material can thus be achieved notwithstanding the heterogeneous reaction conditions.
摘要:
A method of improving the mechanical properties of polymers is described. The method involves heat treating the polymer at a temperature below the glass transition temperature in a wet or in a dry environment. Polymer articles capable of moisture uptake in humid environments, as well as polymer articles less susceptible to moisture uptake, have improved mechanical properties, particularly improved stress relaxation behavior and set properties, when treated in accord with the heat treatment method.
摘要:
Intermediate products (compounds, semi-finished goods) for polymer materials having coupled components, to the polymer materials based on the intermediate products, and to the components to be manufactured therefrom. A method for producing intermediate products, polymer materials and components, and to the use thereof.