US4381332A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesive and resulting nonwoven fabric
Assignee: WR Grace and Co
•
Filing: 1982-01-19
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Granted: 1983-04-26
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Expires: 2002-01-19
Abstract
Abstract A prepolymer having a molecular weight of at least 3,000 is made from a polyether polyol where all the OH groups are capped with an aliphatic polyisocyanate. When mixed with water the prepolymer reacts to form an elastomeric cross-linked polyurethane gel adhesive which can be used to adhere fibers to from a nonwoven fabric. Examples of the aliphatic diisocyanate are IPDI (isophorone diisocyanate) and hydrogenated MDI. A catalyst can also be applied to the aqueous mixture to accelerate the adhesive binder formation.
Inventors
- 👤 Glenn E. Fulmer
- 👤 Louis L. Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:09
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/564; C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; C08G18/4837; C08G18/70; C08G18/72; C08G18/73; C08G18/74; C08G18/75; C08G2210/00; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904; Y10T428/2905; Y10T428/2907; Y10T428/31504; Y10T428/31551; Y10T428/31565; Y10T442/00; Y10T442/20; Y10T442/2861
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
62 words
A method of adhering fibers to form a nonwoven fabric comprising applying to the fibers an elastomeric cross-linked polyurethane gel composition which is formed by reacting together water and a water soluble or dispersible prepolymer having a number average molecular weight of about at least 3,000 of a polyether polyol having essentially all of the OH groups capped with an aliphatic polyisocyanate.
Claim 2
Independent Claim
62 words
A method of adhering fibers to form a nonwoven fabric comprising applying to the fibers an elastomeric cross-linked polyurethane gel composition which is formed by reacting together water and a water soluble or dispersible prepolymer having a number average molecular weight of about at least 3,000 of a polyether polyol having essentially all of the OH groups capped with an aliphatic polyisocyanate.
Claim 3
Dependent Claim
26 words
A method according to claim 1, wherein the prepolymer is added in an amount of 1 to 50 parts by weight per 100 parts of water.
Claim 4
Dependent Claim
13 words
A method according to claim 1, wherein the aliphatic isocyanate is isophorone diisocyanate.
Claim 5
Dependent Claim
15 words
A method according to claim 1, wherein the aliphatic isocyanate is methylene bis(4 cyclohexyl isocyanate).
Claim 6
Dependent Claim
21 words
A method according to claim 1, wherein a catalyst is further added to assist forming the elastomeric cross-linked polyurethane gel composition.
Claim 7
Dependent Claim
23 words
A method according to claim 5, wherein the catalyst is added after the elastomeric polyurethane gel composition has been applied to the fibers.
Claim 8
Dependent Claim
29 words
A method according to claim 5, wherein the catalyst is selected from the group consisting of sodium carbonate, triethylenetetramine, diethylenetriamine, sodium bicarbonate, potassium hydroxide, ammonium hydroxide and calcium oxide.
Claim 9
Dependent Claim
27 words
A method according to claim 7, wherein the catalyst is selected from the group consisting of sodium carbonate, sodium bicarbonate, potassium hydroxide, ammonium hydroxide and calcium oxide.
Claim 10
Dependent Claim
15 words
A method according to claim 8, wherein the catalyst is sodium carbonate or sodium bicarbonate.
Claim 11
Dependent Claim
12 words
A method according to claim 1, wherein the fibers are polyester fibers.
Claim 12
Dependent Claim
35 words
A method according to claim 3, wherein a catalyst selected from the group consisting of sodium carbonate, sodium bicarbonate, potassium hydroxide, ammonium hydroxide and calcium oxide is further added to the elastomeric polyurethane gel composition.
Claim 13
Dependent Claim
10 words
A nonwoven fabric made by the method of claim 1.
Claim 14
Dependent Claim
10 words
A nonwoven fabric made by the method of claim 11.
Claim 15
Dependent Claim
58 words
A nonwoven fabric in which the fibers are bound together with an elastomeric cross-linked polyurethane gel composition which is formed by reacting together water and a water soluble or dispersible prepolymer having a number average molecular weight of about at least 3,000 of a polyether polyol having essentially all of the OH groups capped with an aliphatic polyisocyanate.
Claim 16
Dependent Claim
58 words
A nonwoven fabric in which the fibers are bound together with an elastomeric cross-linked polyurethane gel composition which is formed by reacting together water and a water soluble or dispersible prepolymer having a number average molecular weight of about at least 3,000 of a polyether polyol having essentially all of the OH groups capped with an aliphatic polyisocyanate.
Claim 17
Dependent Claim
27 words
A nonwoven fabric according to claim 14, wherein the prepolymer is added in an amount of 1 to 50 parts by weight per 100 parts of water.
Claim 18
Dependent Claim
14 words
A nonwoven fabric according to claim 14, wherein the aliphatic isocyanate is isophorone diisocyanate.
Claim 19
Dependent Claim
16 words
A nonwoven fabric according to claim 14, wherein the aliphatic isocyanate is methylene bis(4 cyclohexyl isocyanate).
Claim 20
Dependent Claim
22 words
A nonwoven fabric according to claim 14, wherein a catalyst is further added to assist forming the elastomeric cross-linked polyurethane gel composition.
Claim 21
Dependent Claim
24 words
A nonwoven fabric according to claim 18, wherein the catalyst is added after the elastomeric polyurethane gel composition has been applied to the fibers.
Claim 22
Dependent Claim
30 words
A nonwoven fabric according to claim 18, wherein the catalyst is selected from the group consisting of sodium carbonate, triethylenetetramine, diethylenetriamine, sodium bicarbonate, potassium hydroxide, ammonium hydroxide and calcium oxide.
Claim 23
Dependent Claim
28 words
A nonwoven fabric according to claim 20, wherein the catalyst is selected from the group consisting of sodium carbonate, sodium bicarbonate, potassium hydroxide, ammonium hydroxide and calcium oxide.
Claim 24
Dependent Claim
16 words
A nonwoven fabric according to claim 21, wherein the catalyst is sodium carbonate or sodium bicarbonate.
Claim 25
Dependent Claim
13 words
A nonwoven fabric according to claim 14, wherein the fibers are polyester fibers.
Claim 26
Dependent Claim
15 words
The method according to claim 1 wherein the prepolymer is a liquid at room temperature.
Claim 27
Dependent Claim
44 words
The method according to claim 1 wherein the polyether polyol is made of random ethylene oxide units and other alkylene oxide units with the ethylene oxide units comprising at least about 50 percent of the total number of ethylene oxide and alkylene oxide units.
Claim 28
Dependent Claim
28 words
The method according to claim 25 wherein the ethylene oxide units comprise at least about 70 percent of the total number of ethylene oxide and alkylene oxide units.
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) | 1986-04-25 | 1986-10-25 | 1987-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-25 | 1990-10-25 | 1991-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-25 | 1994-10-25 | 1995-04-26 | $7700.00 | Window Closed / Lapsed |