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US 4,892,903 AGranted
Elastomeric fibers, structures fashioned therefrom and elastomeric films
AssigneeShell Oil Company
InventorGlenn R. Himes
Life of this patent
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AssigneeShell Oil Company
InventorGlenn R. Himes
Estimating the term…
An elastic fiber or film prepared from a composition comprising at least one block copolymer containing at least two polymeric blocks containing predominantly monoalkenyl aromatic hydrocarbon monomer units having a weight-average molecular weight within the range from about 4,000 to about 50,000 and at least one polymeric block containing predominantly hydrogenated conjugated diolefin monomer units having a weight-average molecular weight within the range from about 10,000 to about 200,000, a relatively low molecular weight polymer selected from the Group consisting of anionic styrene homopolymers, .alpha.-methylstyrene homopolymers, hydrogenated styrene, copolymers of .alpha.-methylstyrene and styrene and mixtures thereof and may contain a wax. In particularly preferred embodiments, the elastic fiber or film will contain at least one A-B-A triblock copolymer and an A-B' diblock copolymer. In even more preferred embodiments, the elastic fibers or films will contain at least two A-B-A triblock copolymers and at least one A-B' diblock copolymer. In the even more preferred embodiments, the first of the A-B-A triblock copolymers will have A polymeric blocks having a weight-average molecular weight within the range from about 5,000 to about 9,000 and B polymeric blocks having weight-average molecular weights within the range from about 30,000 to about 50,000 and the second of the A-B-A triblock copolymers will have A polymeric blocks having weight-average molecular weights within the range from about 4,000 to about 7,000 and B polymeric blocks having weight-average molecular weights within the range from about 55,000 to about 90,000. The A-B' diblock will, in these even more preferred embodiments, have A polymeric blocks having weight-average molecular weights within the range from about 4,000 to about 9,000 and B' polymeric blocks having a weight-average molecular weight within the range from about 13,750 to about 67,500. The elastic fibers may be prepared using any of the methods known in the prior art including melt blowing. The elastic films may be used to prepare elastic articles of manufacture. The fibers and films may be used immediately or directly after preparation in the production of the desired product or products.
An elastomeric fiber comprising at least one block copolymer comprising at least two polymeric blocks containing predominantly monoalkenyl aromatic hydrocarbon monomer units having a weight-average molecular weight within the range from about 4,000 to about 50,000 and at least one polymeric block containing predominantly conjugated diolefin monomer units which have been hydrogenated so as to saturate at least about 80% of the ethylenic unsaturation in the polymer block after its preparation and having a weight-average molecular weight within the range from about 10,000 to about 200,000, from about 5 parts to about 50 parts, by weight, per 100 parts, by weight, of block copolymer of a polymer selected from the Group consisting of homopolymers of anionic polystyrene, homopolymers of .alpha.-methylstyrene, hydrogenated polystyrene, and copolymers of .alpha.-methylstyrene and styrene, said polymer selected from said group having a weight-average molecular weight within the range from about 1,000 to about 17,000 and from about 0 parts to about 50 parts, by weight, per 100 parts, by weight, of combined block copolymer of a parraffinic and/or microcrystalline wax.
An elastomeric fiber comprising at least one A-B-A triblock copolymer wherein A is a polymeric block containing predominantly monoalkenyl aromatic hydrocarbon units having a weight-average molecular weight within the range from about 4,000 to about 50,000 and B is a polymeric block containing predominantly conjugated diolefin monomer units which have been hydrogenated so as to saturate at least about 80% of the ethylenic unsaturation in the polymer block after its preparation and having a weight-average molecular weight within the range from about 10,000 to about 200,000, and A-B' diblock copolymer wherein A is a polymeric block containing predominantly monoalkenyl aromatic hydrocarbon monomer units having a weight-average molecular weight within the range from about 4,000 to about 50,000 and B' is a polymeric block containing predominantly conjugated diolefin monomer units which have been hydrogenated so as to saturate at least about 80% of the ethylenic unsaturation in the polymer block after its preparation and having a weight-average molecular weight within the range from about 2,500 to about 150,000, from about 5 parts to about 50 parts, by weight, per 100 parts, by weight, of combined block copolymer of a polymer selected from the group consisting of anionic polystyrene, .alpha.-methylstyrene homopolymers, hydrogenated polystyrene (styrene), copolymers of .alpha.-methylstyrene and styrene and mixtures thereof, said polymer selected from said group having a weight-average molecular weight within the range from about 1,000 to about 17,000 and from about 0 parts to about 50 parts, by weight, per 100 parts, by weight, combined block copolymer of a paraffinic and/or microcrystalline wax.
A nonwoven structure prepared with an elastomeric fiber comprising at least one block copolymer comprising at least two polymeric blocks containing predominantly monoalkenyl aromatic hydrocarbon monomer units having a weight-average molecular weight within the range from about 4,000 to about 50,000 and at least one polymeric block containing predominantly conjugated diolefin monomer units which have been hydrogenated so as to saturate at least about 80% of the ethylenic unsaturation in the polymer block after its preparation and having a weight-average molecular weight within the range from about 10,000 to about 200,000, from about 5 parts to about 50 parts, by weight, per 100 parts, by weight, of block copolymer of a polymer selected from the Group consisting of anionic polystyrene, homopolymers of .alpha.-methylstyrene, hydrogenated polystyrene, and copolymers of .alpha.-methylstyrene and styrene, said polymer selected from said group having a weight-average molecular weight within the range from about 1,000 to about 17,000 and from about 0 parts to about 50 parts, by weight, per 100 parts, by weight, of combined block copolymer of a paraffinic and/or microcrystalline wax.
A nonwoven structure prepared with an elastomeric fiber comprising at least one A-B-A triblock copolymer wherein A is a polymeric block containing predominantly monoalkenyl aromatic hydrocarbon units having a weight-average molecular weight within the range from about 4,000 to about 50,000 and B is a polymeric block containing predominantly conjugated diolefin monomer units which have been hydrogenated so as to saturate at least about 80% of the ethylenic unsaturation in the polymer block after its preparation and having a weight-average molecular weight within the range from about 10,000 to about 200,000, and A-B' diblock wherein A is a polymeric block containing predominantly monoalkenyl aromatic hydrocarbon monomer units having a weight-average molecular weight within the range from about 4,000 to about 50,000 and B' is a polymeric block containing predominantly conjugated diolefin monomer units which have been hydrogenated so as to saturate at least about 80% of the ethylenic unsaturation in the polymer block after its preparation and having a weight-average molecular weight within the range from about 2,500 to about 150,000, from about 5 parts to about 50 parts, by weight, per 100 parts, by weight, of combined block copolymer of a polymer selected from the group consisting of anionic styrene homopolymers, .alpha.-methylstyrene homopolymers, hydrogenated polystyrene, copolymers of .alpha.-methylstyrene and styrene and mixtures thereof, said polymer selected from said group having a weight-average molecular weight within the range from about 1,000 to about 17,000 and from about 0 parts to about 50 parts, by weight, per 100 parts, by weight, combined block copolymer of a paraffinic and/or microcrystalline wax.
An elastomeric film comprising at least one block copolymer comprising at least two polymeric blocks containing predominantly monoalkenyl aromatic hydrocarbon monomer units having a weight-average molecular weight within the range from about 4,000 to about 50,000 and at least one polymeric block containing predominantly conjugated diolefin monomer units which have been hydrogenated so as to saturate at least about 80% of the ethylenic unsaturation in the polymer block after its preparation and having a weight-average molecular weight within the range from about 10,000 to about 200,000, from about 5 parts to about 50 parts, by weight, per 100 parts, by weight, of block copolymer of a polymer selected from the Group consisting of homopolymers of anionic styrene, homopolymers of .alpha.-methylstyrene, hydrogenated polystyrene, and copolymers of .alpha.-methylstyrene and styrene, said polymer selected from said group having a weight-average molecular weight within the range from about 1,000 to about 17,000 and from about 0 parts to about 50 parts, by weight, per 100 parts, by weight, of block copolymer of a paraffinic and/or microcrystalline wax.
An elastomeric film comprising at least one A-B-A triblock ocpolymer wherein A is a polymeric block containign predominantly monoalkenyl aromatic hydrocarbon units having a weight-average molecular weight within the range from about 4,000 to about 50,000 and B is a polymeric block containing predominantly conjugated diolefin monomer units which have been hydrogenated so as to saturate at least about 80% of the ethylenic unsaturation in the polymer block after its preparation and having a weight-average molecular weight within the range from about 10,000 to about 200,000, an A-B' diblock copolymer wherein A is a polymeric block containing predominantly monoalkenyl aromatic hydrocarbon monomer units having a weight-average molecular weight within the range from about 4,000 to about 50,000 and B' is a polymeric block containing predominantly conjugated diolefin monomer units which have been hydrogenated so as to saturate at least about 80% of the ethylenic unsaturation in the polymer block after its preparation and having a weight-average molecular weight within the range from about 2,500 to about 150,000, from about 5 parts to about 50 parts, by weight, per 100 parts, by weight, of combined block copolymer of a polymer selected from the group consisting of anionic styrene homopolymers, .alpha.-methylstyrene homopolymers, hydrogenated polystyrene, copolymers of .alpha.-methylstyrene and styrene and mixtures thereof, said polymer selected from said group having a weight-average molecular weight within the range from about 1,000 to about 17,000 and from about 0 parts to about 50 parts, by weight, per 100 parts, by weight, combined block copolymer of a paraffinic and/or microcrystalline wax.
Dependencies are inferred from the claim text.