摘要:
This invention relates to the reaction products of butyrolactone and an aliphatic amine utilizable as a chain extender and curing agent for castable polyurethanes and to the process employing said products in preparing castable polyurethane elastomers and to the process for preparing the butyrolactone amine adducts. The aliphatic amine reactants employed in preparing the butyrolactoneamine adducts are defined by the formula: ##STR1## wherein X is amino (--NH.sub.2) or hydroxy (--OH); R is hydrogen (--H) or methyl (--CH.sub.3) and n has a value of 1 to 2, which amines are reacted with butyrolactone in a mole ratio of between about 1:1 and about 1:3 to provide a curing agent having superior mechanical properties and having the formula: ##STR2## wherein R is hydrogen or methyl, R' is a hydroxy group or ##STR3## and n has a value of 1 or 2.
摘要:
A chain extending agent for reaction injection molding (RIM) comprising a normally liquid blend of butanediol and a toluene diamine mono-substituted with an electron withdrawing group and having the formula ##STR1## wherein X is vicinal to an amino radical and is selected from the group of halogen, CN, NO.sub.2, acyl, carboxylate and isomeric mixtures thereof, and wherein the butanediol and diamine are combined in a critical mole ratio of from 4:1 to about 19:1. The above blend is particularly useful in the preparation of large moldings of polyurethane-polyurea elastomer by the RIM or RRIM (reinforced reaction injection molding) process wherein instant preformed blend is added to a mixture of polyol reactant and catalyst before polymerization in the mold with isocyanate to produce a urethane/urea polymer product of improved properties. Accordingly, the invention also concerns an enhanced RIM or RRIM process and improved product by the use of a mixture of the present chain extender blend and polyol reactant maintainable in the liquid state at ambient temperature.
摘要:
A castable polyurethane elastomer comprising the polymerization reaction product of a polyurethane prepolymer and 2,3-bis(hydroxymethyl) bicyclo [2,2,1] heptane as a chain extender. The elastomer has an advantageously low rebound property, which makes it particularly useful in shock absorber and anti-vibration mounting applications.
摘要:
A chain extending agent for reaction injection molding (RIM) comprising a normally liquid blend of butanediol and a toluene diamine mono-substituted with an electron withdrawing group and having the formula ##STR1## wherein X is vicinal to an amino radical and is selected from the group of halogen, CN, NO.sub.2, acyl, carboxylate and isomeric mixtures thereof, and wherein the butanediol and diamine are combined in a critical mole ratio of from 4:1 to about 19:1. The above blend is particularly useful in the preparation of large moldings of polyurethane-polyurea elastomer by the RIM or RRIM (reinforced reaction injection molding) process wherein instant preformed blend is added to a mixture of polyol reactant and catalyst before polymerization in the mold with isocyanate to produce a urethane/urea polymer product of improved properties. Accordingly, the intention also concerns an enhanced RIM or RRIM process and improved product by the use of a mixture of the present chain extender blend and polyol reactant maintainable in the liquid state at ambient temperature.
摘要:
A low molecular weight hair spray resin containing a vinyl monomer having a ##STR1## electron withdrawing group and consisting essentially of alternating units of vinyl ester and an alkyl half ester maleate derived from an alternating vinyl ester/maleic anhydride copolymer. The resins of this invention are defined by the structure: ##STR2## wherein R and R.sub.1 are each independently alkyl having from 1 to 6 carbon atoms and n has a value between about 40 and 250, preferably 60 to 220.
摘要:
Improved reinforced polyurethane/urea articles are made by reacting an organic polyisocyanate with low viscosity imino/enamine-functional compounds in contact with fiberous reinforcing agents.
摘要:
Tough, moldable copolymers can be made from a reaction system which comprises polymer precursor compounds which form a polymer containing urea and amide linkages and an unsaturated monomer which forms an additional polymer, together with an interpolymer crosslinker which crosslinks the polymer to the addition polymer.