US4125663A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Article and process for the manufacture of a carrier web
Assignee: Hoechst AG
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Filing: 1977-05-02
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Granted: 1978-11-14
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Expires: 1997-05-02
Abstract
Abstract A process is described for the production of a carrier web of a spun bond consisting of synthetic polyester filaments having a melting point of more than 230 DEG C and a filament titer of approximately 3 to 15 dtex. To this spun bond, a chemical binder is applied in the form of an aqueous dispersion which is dried at approximately 120 DEG to 220 DEG C. The dispersion consists of (A) 10 TO 60% BY WEIGHT OF A COPOLYMER OF 60 TO 90% BY WEIGHT OF STYRENE, 5 TO 20% BY WEIGHT OF BUTADIENE, 2 TO 10% BY WEIGHT OF ACRYLIC ACID AND 2 TO 10% BY WEIGHT OF ACRYLAMIDE, (B) 5 TO 30% BY WEIGHT, CALCULATED ON THE AMOUNT OF COPOLYMER, OF A MELAMINE FORMALDEHYDE PRECONDENSATE, (C) A CATALYTIC AMOUNT OF ACID CATALYSTS, AS WELL AS, OPTIONALLY, (D) FURTHER INERT ADDITIVES.
Inventors
- 👤 Peter Eckardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:12
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/005; D04H3/009; D04H3/011; D04H3/08; D04H3/12; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T442/00; Y10T442/60; Y10T442/681
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
156 words
In a process for the production of a carrier web of a spun bond consisting of synthetic polyester filaments having a melting point of more than 230° C. and a filament titer of approximately 3 to 15 dtex, bonded by approximately 10 to 30% by weight, calculated on the unbonded spun bond, of a chemical binder, by applying the same to the spun bond in the form of an aqueous dispersion and hardening by drying at approximately 120 to 220° C., the improvement which comprises using an aqueous dispersion comprising (a) 10 to 60% by weight consisting of a copolymer of 60 to 90% by weight of styrene, 5 to 20% by weight of butadiene, 2 to 10% by weight of acrylic acid and 2 to 10% by weight of acrylamide, (b) 5 to 30% by weight, calculated on the amount of copolymer, of a melamine formaldehyde precondensate, and (c) a catalytic amount of acid catalyst.
Claim 2
Dependent Claim
156 words
In a process for the production of a carrier web of a spun bond consisting of synthetic polyester filaments having a melting point of more than 230° C. and a filament titer of approximately 3 to 15 dtex, bonded by approximately 10 to 30% by weight, calculated on the unbonded spun bond, of a chemical binder, by applying the same to the spun bond in the form of an aqueous dispersion and hardening by drying at approximately 120 to 220° C., the improvement which comprises using an aqueous dispersion comprising (a) 10 to 60% by weight consisting of a copolymer of 60 to 90% by weight of styrene, 5 to 20% by weight of butadiene, 2 to 10% by weight of acrylic acid and 2 to 10% by weight of acrylamide, (b) 5 to 30% by weight, calculated on the amount of copolymer, of a melamine formaldehyde precondensate, and (c) a catalytic amount of acid catalyst.
Claim 3
Dependent Claim
16 words
The process according to claim 1, wherein the polyester filaments used are composed of polyethylene terephthalate.
Claim 4
Dependent Claim
107 words
A carrier web of a chemically bonded spun bond of synthetic polyester filaments having a melting point of more than 230° C. and an individual filament titer of approximately 3 to 15 dtex, characterized by a weight per unit area of approximately 80 to 400 g/m 2 a strength, longitudinally, of approximately 30 to 140 daN/5 cm, an elongation at break, longitudinally, of approximately 20 to 50%, a break propagation resistance of approximately 2 to 9 daN, a specific strength of at least 38 (daN/5 cm) ÷ (100 g/m.sup.2) and a specific elongation, longitudinally, at 180° C. and 5 daN/5 cm load, of 600%. g/m 2 maximum.
Claim 5
Dependent Claim
107 words
A carrier web of a chemically bonded spun bond of synthetic polyester filaments having a melting point of more than 230° C. and an individual filament titer of approximately 3 to 15 dtex, characterized by a weight per unit area of approximately 80 to 400 g/m 2 a strength, longitudinally, of approximately 30 to 140 daN/5 cm, an elongation at break, longitudinally, of approximately 20 to 50%, a break propagation resistance of approximately 2 to 9 daN, a specific strength of at least 38 (daN/5 cm) ÷ (100 g/m.sup.2) and a specific elongation, longitudinally, at 180° C. and 5 daN/5 cm load, of 600%. g/m 2 maximum.
Claim 6
Dependent Claim
103 words
A carrier web according to claim 3, wherein the chemically bonded spun bond is bonded with approximately 10 to 30% by weight, calculated on the unbonded spun bond, of a polymeric binder deposited from an aqueous dispersion containing (a) 10 to 60% by weight consisting of a copolymer of 60 to 90% by weight of styrene, 5 to 20% by weight of butadiene, 2to 10% by weight of acrylic acid and 2 to 10% by weight of acrylamide, (b) 5 to 30% by weight, calculated on the amount of copolymer, of a melamine formaldehyde precondensate, and (c) a catalytic amount of acid catalyst.
Claim 7
Dependent Claim
21 words
A process according to claim 1 wherein the aqueous dispersion comprises, in addition to components (a), (b) and (c), inert additives.
Claim 8
Dependent Claim
28 words
A carrier web according to claim 4 wherein the polymeric binder is deposited from an aqueous dispersion containing, in addition to components (a), (b) and (c), inert additives.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |