US4171391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing composite sheet material
Assignee: Seton Co
•
Filing: 1978-09-07
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Granted: 1979-10-16
•
Expires: 1998-09-07
Abstract
Abstract A method of preparing a composite sheet material having properties similar to leather is provided. At least a portion of a porous sheet material is impregnated with an aqueous ionic dispersion of a polyurethane polymer. The polyurethane polymer which is impregnated in the porous sheet is ionically coagulated from the dispersion. Preferably, both the ionic dispersing and coagulating media are removed from the impregnated sheet. The impregnant is then dried to form a composite sheet material.
Inventors
- 👤 Gordon M. Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:58
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/12; D06N3/14; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C08G18/0809; C08G18/0814; C08G18/0819; C08G18/0823; Y; Y10; Y10S; Y10S428/00; Y10S428/904
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
82 words
A method of preparing a composite sheet material comprising: (a) impregnating at least a portion of a porous sheet material with an aqueous ionic dispersion of a polyurethane polymer having solubilizing ionizable groups covalently bonded to the polymer chain which are reacted with an ionic dispersing agent, said polyurethane polymer having substantially no unreacted N═C═O groups; (b) ionically coagulating said polyurethane polymer from said dispersion impregnated in said porous sheet material; and (c) drying said impregnant to form a composite sheet material.
Claim 2
Independent Claim
82 words
A method of preparing a composite sheet material comprising: (a) impregnating at least a portion of a porous sheet material with an aqueous ionic dispersion of a polyurethane polymer having solubilizing ionizable groups covalently bonded to the polymer chain which are reacted with an ionic dispersing agent, said polyurethane polymer having substantially no unreacted N═C═O groups; (b) ionically coagulating said polyurethane polymer from said dispersion impregnated in said porous sheet material; and (c) drying said impregnant to form a composite sheet material.
Claim 3
Dependent Claim
21 words
The method of claim 1 including removing substantially all of the dispersing agent from the impregnated sheet prior to said drying.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein said aqueous ionic polyurethane polymer dispersion has a solids content of 5% to 50% by weight.
Claim 5
Dependent Claim
22 words
The method of claim 3 wherein said aqueous ionic polyurethane polymer dispersion has a solids content of 10% to 40% by weight.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein said aqueous ionic polyurethane polymer dispersion has a viscosity of 10 to 5,000 centipoise.
Claim 7
Dependent Claim
20 words
The method of claim 5 wherein said aqueous ionic polyurethane polymer dispersion has a viscosity of 10 to 1,000 centipoise.
Claim 8
Dependent Claim
19 words
The method of claim 1 wherein said dried composite is comprised of 5% to 70% by weight polyurethane polymer.
Claim 9
Dependent Claim
19 words
The method of claim 1 wherein said dried composite is comprised of 15% to 50% by weight polyurethane polymer.
Claim 10
Dependent Claim
26 words
The method of claim 1 wherein a porous substrate is selected from the group consisting of woven fabrics, non-woven fabrics, spun-bonded sheets, needled batts and waterleaves.
Claim 11
Dependent Claim
84 words
The method of claim 1 wherein said aqueous ionic dispersion of polyurethane is prepared by: (a) reacting a stoichiometric excess of diisocyanate with a reactive hydrogen compound to form an isocyanate terminated intermediate; (b) reacting the reactive hydrogens of a solubilizing compound with the isocyanate terminated intermediate to impart solubilizing ionizable groups covalently bonded to the polymer chain; (c) reacting a dispersing agent with said solubilizing compound; and (d) chain extending the product formed in (c), to react substantially all of the N═C═O groups.
Claim 12
Dependent Claim
12 words
The method of claim 10 wherein said chain extension is with water.
Claim 13
Dependent Claim
15 words
The method of claim 10 wherein said chain extension is with water and a diamine.
Claim 14
Dependent Claim
18 words
The method of claim 10 including the step of adjusting the solids concentration by the addition of water.
Claim 15
Dependent Claim
22 words
The method of claim 10 wherein said diisocyanate is selected from the group consisting of tolylene diisocyanate, isophorone diisocyanate, and 4,4'-methylene-bis(cyclohexyl isocyanate).
Claim 16
Dependent Claim
15 words
The method of claim 10 wherein said reactive hydrogen compound is a diol or triol.
Claim 17
Dependent Claim
12 words
The method of claim 15 wherein said diol is a polyether polyol.
Claim 18
Dependent Claim
17 words
The method of claim 16 wherein said polyether polyol has a molecular weight of 50 to 10,000.
Claim 19
Dependent Claim
17 words
The method of claim 17 wherein said polyether polyol has a molecular weight of at least 400.
Claim 20
Dependent Claim
12 words
The method of claim 15 wherein said diol is a polyester diol.
Claim 21
Dependent Claim
10 words
The method of claim 19 wherein said diol is polycaprolactone.
Claim 22
Dependent Claim
16 words
The method of claim 10 wherein said solubilizing compound is a 2,2-hydroxy methyl substituted carboxylic acid.
Claim 23
Dependent Claim
14 words
The method of claim 21 wherein said solubilizing compound is 2,2-di-(hydroxy methyl) propionic acid.
Claim 24
Dependent Claim
13 words
The method of claim 10 wherein said dispersing agent is a mono-tertiary amine.
Claim 25
Dependent Claim
11 words
The method of claim 23 wherein said mono-amine is N-ethyl morpholine.
Claim 26
Dependent Claim
18 words
The method of claim 1 wherein said ionic coagulation is conducted by dipping in an aqueous acid bath.
Claim 27
Dependent Claim
13 words
The method of claim 25 wherein said aqueous acid bath contains acetic acid.
Claim 28
Dependent Claim
27 words
The method of claim 1 wherein said ionic coagulation is conducted by contacting the impregnated substrate with an aqueous ionic media to replace the ionic dispersing agent.
Claim 29
Dependent Claim
12 words
The method of claim 10 wherein said dispersing agent is an acid.
Claim 30
Dependent Claim
18 words
The method of claim 28 wherein said ionic coagulation is conducted by dipping in an aqueous base bath.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |