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US5118762A
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US
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Styrene-isoprene-styrene block copolymer composition for low viscosity low temperature hot melt adhesives
Assignee: Kraton Polymers US LLC
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Filing: 1990-04-11
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Granted: 1992-06-02
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Expires: 2010-04-11
Abstract
Abstract A low viscosity low temperature hot melt adhesive which contains a predominantly branched styrene-isoprene-styrene block copolymer composition comprised of linear polymeric blocks wherein the polystyrene block molecular weight is greater than about 12,000, the polystyrene content is about 35% or less by weight of the block copolymer composition and the molecular weight of the block copolymer composition and the coupling efficiency are chosen so that the melt viscosity of the adhesive made with the composition is less than about 3100 cps.
Inventors
- 👤 Steven S. Chin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:37
CPC Classifications
C; C08; C08F; C08F297/00; C08F297/02; C08F297/04; C08F297/046; C09; C09J; C09J125/00; C09J125/02; C09J125/04; C09J125/08; C09J153/00; C09J153/02; C08L; C08L2666/00; C08L2666/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
108 words
A branched styrene-isoprene-styrene block copolymer composition comprised of linear polymeric blocks for use in diaper adhesives which have a melt viscosity of less than 3100 cps at a temperature of 350° F. and a SAFT of greater than 71° C., said block copolymer composition characterized in that (a) the polystyrene block molecular weight is greater than about 12,000, (b) the polystyrene content is about 35% or less by weight of the block copolymer composition and (c) the molecular weight of the block copolymer composition and the coupling efficiency are chosen so that the melt viscosity of a diaper adhesive made with the composition is less than 3100 cps.
Claim 2
Dependent Claim
108 words
A branched styrene-isoprene-styrene block copolymer composition comprised of linear polymeric blocks for use in diaper adhesives which have a melt viscosity of less than 3100 cps at a temperature of 350° F. and a SAFT of greater than 71° C., said block copolymer composition characterized in that (a) the polystyrene block molecular weight is greater than about 12,000, (b) the polystyrene content is about 35% or less by weight of the block copolymer composition and (c) the molecular weight of the block copolymer composition and the coupling efficiency are chosen so that the melt viscosity of a diaper adhesive made with the composition is less than 3100 cps.
Claim 3
Dependent Claim
24 words
The composition of claim 1 having an SAFT of 75° C. or more wherein the polystyrene block molecular weight is greater than about 14,000.
Claim 4
Dependent Claim
40 words
A diaper adhesive comprising the block copolymer composition of claim 2 and from about 20 to about 400 parts by weight per 100 parts of the block copolymer composition of a tackifying resin that is compatible with the isoprene block.
Claim 5
Dependent Claim
139 words
A diaper adhesive composition having a melt viscosity of less than 3100 cps at a temperature of 350° F. and an SAFT of greater than 71° C. which comprises (a) a branched styrene-isoprene-styrene block copolymer composition comprised of linear polymeric blocks, said block copolymer composition characterized in that (i) the polystyrene block molecular weight is greater than about 12,000, (ii) the polystyrene content is about 35% or less by weight of the block copolymer composition and (iii) the molecular weight of the block copolymer composition and the coupling efficiency are chosen so that the melt viscosity of a diaper adhesive made with the composition is less than 3100 cps; and (b) from about 20 to about 400 parts by weight per 100 parts of the block copolymer composition of a tackifying resin that is compatible with the isoprene block.
Claim 6
Dependent Claim
139 words
A diaper adhesive composition having a melt viscosity of less than 3100 cps at a temperature of 350° F. and an SAFT of greater than 71° C. which comprises (a) a branched styrene-isoprene-styrene block copolymer composition comprised of linear polymeric blocks, said block copolymer composition characterized in that (i) the polystyrene block molecular weight is greater than about 12,000, (ii) the polystyrene content is about 35% or less by weight of the block copolymer composition and (iii) the molecular weight of the block copolymer composition and the coupling efficiency are chosen so that the melt viscosity of a diaper adhesive made with the composition is less than 3100 cps; and (b) from about 20 to about 400 parts by weight per 100 parts of the block copolymer composition of a tackifying resin that is compatible with the isoprene block.
References Cited (Backward Citations)
US3149182A
Cited
US3135716A
Cited
US3078254A
Cited
US3231635A
Cited
US3468972A
Cited
US3577398A
Cited
US3595941A
Cited
GB1211244A
Cited
US3594452A
Cited
US3614836A
Cited
US3880953A
Cited
US3954692A
Cited
US3753936A
Cited
US3823203A
Cited
US3917607A
Cited
GB1447419A
Cited
US3932330A
Cited
US4117037A
Cited
US4148771A
Cited
US4163764A
Cited
GB1592358A
Cited
JPS55104373A
Cited
JPS5690849A
Cited
US4391949A
Cited
US4391949B1
Cited
US4526577A
Cited
JPS61120732A
Cited
US4944993A
Cited
US4944994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-02 | 1995-12-02 | 1996-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-02 | 1999-12-02 | 2000-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-02 | 2003-12-02 | 2004-06-02 | $7700.00 | Window Closed / Lapsed |