摘要:
The present invention is at least a two-component thermoplastic elastomeric composition comprising at least one block copolymer wherein the composition has essentially the same comparative elasticity, high temperature serviceability and hardness as the unmodified, undiluted (neat) block copolymer portion of the composition. The composition also shows enhanced thermal stability and processibility and is well suited for fabricating elastic moldings, films and fibers as well as for formulating with asphalts, adhesives and sealants. The novel thermoplastic elastomeric composition comprises (a) from about 50 to about 99 percent by weight of at least one block copolymer and (b) about 1 to about 50 percent by weight of at least one ethylene interpolymer having a density from about 0.855 g/cc to about 0.905 g/cc, wherein the ethylene interpolymer in the amount employed is a substantially inert extender of the block copolymer and the composition is further characterized as having:i. storage moduli throughout the range of -26° C. to 24° C. of less than about 3.5x109 dynes/cm2,ii. a ratio of storage modulus at -26° C. to storage modulus at 24° C. of less than about 4, andiii. storage moduli at -26° C. and 24° C. about 0.2 to about 3 times higher than the storage moduli at -26° C. and 24° C., respectively, of the neat block copolymer portion of the composition.
摘要:
The subject invention pertains to non-pourable homogeneous ultra-low molecular weight ethylene polymers and a process for the preparation thereof. Such polymers have longer lamella and greater degree of crystalline organization than corresponding higher molecular weight materials at an equivalent density.
摘要:
Polymer mixtures are disclosed which comprise at least one homogeneously branched ethylene polymer (A) and at least one ethylene polymer (B) having a crystallinity which is at least 7 percent greater than the crystallinity of polymer (A) with certain provisos. A process for making a molded article using the disclosed polymer mixtures is disclosed as well as films, film layers, coatings and molded articles formed from those mixtures. These mixtures have several advantages over polymer compositions of the prior art, including improved properties at elevated temperatures such as improved softening point under load, improved hardness, improved toughness, improved 100 percent modulus of elasticity, improved compression set, improved ability to prevent oil bleed out at lower temperatures when the mixture contains oil and reduced injection molding cycle time. The mixtures retain their performance advantages even when substantial amounts of additives such as oil and filler are incorporated into the mixture. The mixtures may also be cross-linked after they are formed into the shape of an article to form vulcanized elastomeric products. The polymer mixtures have utility in a variety of applications.
摘要:
Random ethylene/alpha-olefin/diene monomer interpolymers with an alpha-olefin distribution that is more clustered than Bernoullian are prepared using Group 4 metal constrained geometry complex catalyst and an activating cocatalyst. The catalyst includes a fused ring indenyl derivative ligand.
摘要:
Polymer mixtures are disclosed which comprise at least one homogeneously branched ethylene polymer (A) and at least one ethylene polymer (B) having a crystallinity which is at least 7 percent greater than the crystallinity of polymer (A) with certain provisos. A process for making a molded article using the disclosed polymer mixtures is disclosed as well as films, film layers, coatings and molded articles formed from those mixtures. These mixtures have several advantages over polymer compositions of the prior art, including improved properties at elevated temperatures such as improved softening point under load, improved hardness, improved toughness, improved 100 percent modulus of elasticity, improved compression set, improved ability to prevent oil bleed out at lower temperatures when the mixture contains oil and reduced injection molding cycle time. The mixtures retain their performance advantages even when substantial amounts of additives such as oil and filler are incorporated into the mixture. The mixtures may also be cross-linked after they are formed into the shape of an article to form vulcanized elastomeric products. The polymer mixtures have utility in a variety of applications.
摘要:
Paintable thermoplastic polyolefin compositions are disclosed which are characterized by (i) 30 to 70 weight percent of at least one polypropylene or graft-modified polypropylene, (ii) 0 to 40 weight percent of at least one nongrafted or graft-modified substantially linear ethylene polymer, and (iii) 0 to 50 weight percent of an interpolymer of ethylene and an α,β-unsaturated carbonyl copolymer, for example a copolymer of ethylene and acrylic acid. The polypropylene and substantially linear ethylene polymer are optionally grafted with an unsaturated organic compound containing at least one ethylenic unsaturation and at least one carbonyl group, for example maleic anhydride. The compositions exhibit excellent paintability with conventional paints without prior application of a primer or surface treatment, good heat resistance, and good low temperature impact resistance and they can be recycled by melt blending the compositions with thermoplastic materials, for example, in an extruder.
摘要:
Disclosed are adhesives and processes for preparing the same, comprising at least one first homogeneous ethylene/alpha-olefin interpolymer, and optionally at least one tackifier, and optionally at least one plasticizer. The claimed adhesives are useful as adhesives such as are employed in various applications, such as in masking tape, clear office tape, labels, decals, bandages, decorative and protective sheets (such as shelf and drawer liners), floor tiles, sanitary napkin/incontinence device placement strips, sun control films, the joining of gaskets to automobile windows, packaging, bookbinding, construction of nonwoven articles, and insulation bonding.
摘要:
The present invention is at least a two-component thermoplastic elastomeric composition comprising at least one block copolymer wherein the composition has essentially the same comparative elasticity, high temperature serviceability and hardness as the unmodified, undiluted (neat) block copolymer portion of the composition. The composition also shows enhanced thermal stability and processibility and is well suited for fabricating elastic moldings, films and fibers as well as for formulating with asphalts, adhesives and sealants. The novel thermoplastic elastomeric composition comprises (a) from about 50 to about 99 percent by weight of at least one block copolymer and (b) about 1 to about 50 percent by weight of at least one ethylene interpolymer having a density from about 0.855 g/cc to about 0.905 g/cc, wherein the ethylene interpolymer in the amount employed is a substantially inert extender of the block copolymer and the composition is further characterized as having:i. storage moduli throughout the range of -26° C. to 24° C. of less than about 3.5x109 dynes/cm2,ii. a ratio of storage modulus at -26° C. to storage modulus at 24° C. of less than about 4, andiii. storage moduli at -26° C. and 24° C. about 0.2 to about 3 times higher than the storage moduli at -26° C. and 24° C., respectively, of the neat block copolymer portion of the composition.