摘要:
Polyurethane sealants and adhesives made with saturated, polyhydroxylated polydiene polymers and polyisocyanates have improved tack and peel strength when the crosslinked polyurethane has non-load bearing saturated hydrocarbon segments formed by use of substantially less than stoichiometric amounts of polyisocyanate or by addition of monohydroxylated polydiene polymers.
摘要:
The present invention is a process for producing high diblock content block copolymer compositions which comprises (a) anionically polymerizing at least one vinyl aromatic hydrocarbon and at least one conjugated diene to form a living block copolymer, (b) coupling the block copolymer with a coupling agent selected from the group consisting of esters of carboxylic acids and asymmetric silanes to create a coupled polymer, (c) combining the coupled polymer with other components to form an enduse composition, and (d) heating the composition at a temperature up to 130.degree. C. for a time sufficient to decouple the coupled copolymer such that the amount of uncoupled copolymer in the composition ranges from 10 to 100% by weight of the total amount of block copolymer.
摘要:
The present invention provides a toughened cycloaliphatic epoxy resin composition comprising:(a) a curable cycloaliphatic epoxy resin,(b) an epoxidized low viscosity polydiene polymer wherein the polymer contains from 2.0 to 6.0 milliequivalents of epoxy per gram of polymer, and(c) a curing agent.
摘要:
A process for making a coating comprises the steps of reacting a monohydroxylated 1,3-butadiene polymer with a multifunctional isocyanate to form a modified resin which is reacted with a hydroxyl groups-containing acrylic or epoxy resin.
摘要:
A coating composition is provided from about 0.5 to about 80 parts by weight of a modified selectively hydrogenated block copolymer comprising at least one block of predominantly vinyl arene monomer units and at least one block which is, before hydrogenation, predominantly conjugated diolefin monomer units, the modified block copolymers having been modified by grafting predominantly to the conjugated diolefin block a carboxylic acid or acid derivative and 100 parts by weight of an epoxy resin. The blend of the modified block copolymer and epoxy resin is heated to above 150.degree. C. for a time sufficient for the carboxylic acid or acid derivative to form an adduct with the epoxy resin. The modified block copolymer forms a stable suspension in the epoxy after the adduct is formed which greatly enhances storage stability.
摘要:
A process for making polymers of conjugated dienes which contain hydroxyl groups in the diene blocks which comprises(a) making a precursor polymer by polymerizing at least one conjugated diene which leaves 1,2 disubstituted, 1,1 disubstituted, 1,1,2 trisubstituted or tetrasubstituted olefinic unsaturation in the polymer,(b) optionally partially hydrogenating said precursor polymer,(c) epoxidizing said precursor polymer such that epoxy groups form at said substituted sites and the amount of epoxy functionality in the polymer is from 0.1 to 5 Meq/g polymer, and(d) reacting the epoxidized polymer with an alcohol solution of hydrochloric acid.A diene polymer containing 0.1 to 10 Meq/g polymer of hydroxyl group and comprised of alcohol units of the formula ##STR1## where R.sub.1 and R.sub.2 are hydrogen or alkyl radicals and X and X' are either --OH or --Cl and at least one of them is --OH.
摘要:
A predominantly linear 100% triblock sequentially polymerized hydrogenated styrene-isoprene-styrene block copolymer composition comprised of linear polymeric blocks for use in adhesives, modified thermoplastic compositions and mechanical goods.
摘要:
An adhesive which contains a tackifying resin and a branched three-armed block copolymer composition comprised of polymeric blocks wherein the molecular weight is from about 180,000 to about 250,000, the polystyrene content is from about 17 to about 23% by weight of the block copolymer composition and the percentage of S-I arms which are load bearing is greater than about 85%.
摘要:
A solar cell assemblage and method of making, comprising:(a) a pre-treated silanized transparent substrate;(b) a layer of semiconductor material;(c) an electrical contact on the surface of said layer of semiconductor material;(d) an extruded transparent film encapsulating the assemblage which comprises 75 to 91 parts by weight of a blend of:65 to 75 parts by weight of a selectively hydrogenated two-block polymer wherein(1) each A is a polymer block of a monovinyl or alpha alkyl monovinyl arene and the A blocks are from 10 to 40% by weight of the total block copolymer, and(2) each B is a polymer block formed by polymerizing a conjugated diene, and the B blocks are 90 to 60% weight of the total block copolymer, and25 to 35 parts by weight of a selectively hydrogenated multiblock copolymer wherein:(1) each A is a polymer endblock of a monovinyl or alpha alkyl monovinyl arene and the A blocks are 10 to 40% by weight of the total block copolymer, and(2) each B is a polymer midblock is formed by polymerizing a conjugated diene and the B blocks are 90 to 10% weight of the total block copolymer,about 8.5 to about 23.5 parts by weight of an (alpha) methyl styrene polymer tackifying resin; andabout 0.5 to about 1.5 parts by weight of a mixture of a phenolic antioxidant, a UV absorber with benzotriazole functionality and a UV absorber with hindered amine functionality;(e) a carbon filled polymer frame; and(f) sealant.
摘要:
Sealant compositions exhibiting good substrate/sealant adhesion comprise 3 to 30 percent by weight of a block copolymer, 2 to 40 percent by weight butyl rubber, 10 to 70 percent by weight of a plasticizing oil having a solubility parameter ranging from 6 to 8, about 1 to about 50 percent by weight of an adhesion promoting resin having a solubility parameter ranging from about 8 to about 12, about 1 to about 70 percent by weight of an inorganic filler and about 0.01 to about 2.0 percent by weight of a UV/oxidation stabilizer or a mixture of UV/oxidation stabilizers.