摘要:
An organic bulk polymer is disclosed having microscopically dispersed therein a liquid crystalline polymer in an amount sufficient to measurably improve the properties of the organic polymer relative to a like bulk polymer in the absence of the liquid crystalline polymer.
摘要:
The inclusion of a polymer containing rigid moieties in an active hydrogen-containing compound has surprisingly been found to yield significant and unexpected improvements in the physical properties of polyurethane and/or polyurea polymers prepared therefrom. In particular, cellular polyurethane and/or polyureas made from these solutions have excellent firmness and high moduli.
摘要:
A solution or colloidal dispersion of a polymer of an ethylenically unsaturated steroid derivative in an active hydrogen-containing compound is claimed. The polymer provides improved physical properties to a polyurethane made by reacting the solution or dispersion with an polyisocyanate.
摘要:
Polyurethanes are prepared from a polyol which itselve contains liquid crystalline moieties or which contains dispersed or dissolved liquid crystalline polymers. The use of this polyol is found to provide improved properties to polyurethanes, especially flexible polyurethane foams, which exhibit improved load bearing.
摘要:
An elastic multilayer composite includes a pattern unbonded elastic layer attached to at least one extensible facing layer. A method for forming an elastic multilayer composite includes the steps of providing an elastic material; bonding the elastic material to form a pattern unbonded elastic material; and attaching the pattern unbonded elastic material to at least one facing material.
摘要:
An elastic material for use in an absorbent article is provided. The elastic material contains a crosslinked network formed from a branched block copolymer having a monoalkenyl aromatic midblock positioned between conjugated diene endblocks (e.g., butadiene-styrene-butadiene (“B-S-B”) triblock copolymer). Prior to crosslinking, the branched block copolymers have a relatively low viscosity and thus may be readily formed into a precursor elastic material (e.g., film, strands, web, etc.) that is subsequently crosslinked to achieve the desired elastic and mechanical properties. Crosslinking is typically achieved through the formation of free radicals (unpaired electrons) that link together to form a plurality of carbon-carbon covalent bonds at the conjugated diene endblocks.
摘要:
Laminate compositions with significantly improved retention of elastic and mechanical properties such as stress relaxation, permanent set, elongation modulus and hysteresis and modulus at temperatures slightly above body temperature, under actual use conditions, are formed from polymeric materials containing styrene copolymers and polymeric compounds blended with polyphenylene ether.
摘要:
A technique for imparting latent elasticity to components of an absorbent article is provided. More specifically, a latent elastic film that contains a crosslinkable semi-crystalline polyolefin is initially incorporated into an absorbent article. The film is not highly elastic prior to crosslinking and is thus dimensionally stable. Consequently, the film need not be maintained in a mechanically stretched condition during attachment to other components of the absorbent article, which provides for greater freedom in the location and manner in which the components are attached together. Once incorporated into the absorbent article, the semi-crystalline polyolefin is crosslinked to form a three-dimensional network having elastic memory. The film may also be heat activated, either through crosslinking or an additional step, to cause the film to shrink and further improve its stretch characteristics.
摘要:
A nonwoven web material that contains an elastic component is provided. The elastic component contains a crosslinked network formed from a linear block copolymer having a monoalkenyl aromatic midblock positioned between conjugated diene endblocks (e.g., butadiene-styrene-butadiene (“B-S-B”) triblock copolymer). Prior to crosslinking, such linear block copolymers have a relatively low viscosity and thus may be readily formed into a precursor elastic component that is subsequently crosslinked to achieve the desired elastic and mechanical properties. Crosslinking is typically achieved through the formation of free radicals (unpaired electrons) that link together to form a plurality of carbon-carbon covalent bonds at the conjugated diene endblocks.
摘要:
The present invention is directed to improved elastic materials. More specifically, the present invention is directed to low basis weight elastic webs, such as elastic films and elastomeric fibrous meltblown or spunbond webs which may include elastomeric fibers and/or elastomeric continuous filaments. The present invention is also directed to laminate structures which include the elastic webs. The elastic webs include an elastomeric block copolymer and a polyolefin wax, and do not include a tackifier. The low basis weight elastic webs of the present invention may display tension values upon elongation equal to or greater than the tension values of previously known elastic webs of greater basis weight. The elastic laminate structures of the present invention comprise at least one layer an elastic web adhesively bonded to one or more other webs, such as, for instance a woven or nonwoven web. The elastic laminate structures made in accordance with the invention have shown remarkably good uniformity, hand, bulk, strength and elastic properties while decreasing the required amount of raw materials. In addition, the individual layers of the disclosed laminate structure may shown improved compatibility with each other and may display improved bonding between layers.