US4906497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave-activatable hot-melt adhesive
Assignee: UZIN-WERK GEORG UTZ & Co KG DIESELSTR 3 7900 ULM WEST GERMANY GmbH
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Filing: 1988-11-04
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Granted: 1990-03-06
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Expires: 2008-11-04
Abstract
Abstract A hot-melt adhesive comprising at least one component which under the action of microwaves on the dry hot-melt adhesive leads to an increased heating-up rate compared with a corresponding dry hot-melt adhesive without said component contains with a view to universal application with highest possible activatability and constant property characteristic as microwave-activatable component electrically conductive substances with an electrical conductivity higher than that of the dry hot-melt adhesive without said component. Provided as electrically conductive substances are in particular carbon fibres, carbon black, graphite, antistatic agents and metal particles, either on their own or in mixtures adapted to the use. Hot-melt adhesive coatings or self-supporting hot-melt adhesive films having these additives have a heating-up rate by microwaves which is greater by a factor of up to 400 than that of conventional microwave-activatable adhesives. This results in an appreciable reduction of the consumption of electrical energy when adhering by microwave activation or a corresponding increase in the laying capacity of the material to be stuck. The new hot-melt adhesive is suitable preferably for microwave-activated hot-melt adhering of sheet substrates, in particular floor coverings, and by rendering the activatability largely independent of the water content of usual adhesives also achieves the uniformity and reproduceability of the activation and melting-on behavior necessary for industrial uses and production.
Inventors
- 👤 Horst D. Hellmann
- 👤 Roland Krieger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:22
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/24; C; C09; C09J; C09J7/00; C09J7/10; H01B1/22; Y; Y10; Y10S; Y10S412/00; Y10S412/90; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/13; Y10T428/1334; Y10T428/1338; Y10T428/1352; Y10T428/1355; Y10T428/1372; Y10T428/16; Y10T428/163; Y10T428/164; Y10T428/166; Y10T428/167; Y10T428/23907; Y10T428/23921; Y10T428/23993; Y10T428/25; Y10T428/256; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/2852; Y10T428/2878; Y10T428/2887
Claims Analysis
Total Claims: 42
Claim 1
Independent Claim
108 words
Hot-melt adhesive comprising at least one component which under the action of microwaves on the dry hot-melt adhesive leads to an increase heating up rate compared with a corresponding dry hot-melt adhesive without said component and thereby to a higher melting-on rate, further comprising a binder base of one or more thermoplastic polymers and a microwave-activatable electrically electrically conductive substance having an electrical conductivity greater than that of a dry hot-melt adhesive without said substance, which adhesive after application to a material to be adhered forms an adhesive coating which is dry after the drying or hardening or setting and only weakly tacky to non-tacky at room temperature.
Claim 2
Dependent Claim
108 words
Hot-melt adhesive comprising at least one component which under the action of microwaves on the dry hot-melt adhesive leads to an increase heating up rate compared with a corresponding dry hot-melt adhesive without said component and thereby to a higher melting-on rate, further comprising a binder base of one or more thermoplastic polymers and a microwave-activatable electrically electrically conductive substance having an electrical conductivity greater than that of a dry hot-melt adhesive without said substance, which adhesive after application to a material to be adhered forms an adhesive coating which is dry after the drying or hardening or setting and only weakly tacky to non-tacky at room temperature.
Claim 3
Dependent Claim
15 words
Hot-melt adhesive according to claim 1, the hot-melt adhesive sheet is weakly tacky to non-tacky.
Claim 4
Dependent Claim
19 words
Hot-melt adhesive according to claim 1, wherein the thickness of the hot-melt adhesive sheet is up to 5 mm.
Claim 5
Dependent Claim
21 words
Hot-melt adhesive according to claim 1, wherein the hot-melt adhesive sheet is formed web-shaped a width of up to 3 meters.
Claim 6
Dependent Claim
14 words
Hot-melt adhesive according to claim 1, wherein said electrically conductive substance comprises carbon fibres.
Claim 7
Dependent Claim
21 words
Hot-melt adhesive according to claim 5, wherein said carbon fibres have a mean length in a range up to 50 mm.
Claim 8
Dependent Claim
26 words
Hot-melt adhesive according to claim 5, wherein said carbon fibres are provided in a proportion of 0.5-30% by weight with respect to the dry adhesive composition.
Claim 9
Dependent Claim
18 words
Hot-melt adhesive according to claim 1, wherein said electrically conductive substance comprises carbon black or carbon black pigments.
Claim 10
Dependent Claim
30 words
Hot-melt adhesive according to claim 8, wherein said carbon black or carbon black pigments are provided in a proportion of 0.5-20% by weight with respect to the dry adhesive composition.
Claim 11
Dependent Claim
13 words
Hot-melt adhesive according to claim 1, wherein said electrically conductive substance is graphite.
Claim 12
Dependent Claim
25 words
Hot-melt adhesive according to claim 10, wherein said graphite is provided in a proportion of 2-40% by weight with respect to the dry adhesive composition.
Claim 13
Dependent Claim
26 words
Hot-melt adhesive according to claim 1, wherein said electrically conductive substance comprises metal particles in the form of powder, flakes, grains, folia, fibres or the like.
Claim 14
Dependent Claim
26 words
Hot-melt adhesive according to claim 12, wherein said metal particles are provided in a proportion of 1-70% by weight with respect to the dry adhesive composition.
Claim 15
Dependent Claim
14 words
Hot-melt adhesive according to claim 1, wherein said electrically conductive substance comprises antistatic agents.
Claim 16
Dependent Claim
26 words
Hot-melt adhesive according to claim 14, wherein said antistatic agents are provided in a proportion of 0.5-20% by weight with respect to the dry adhesive composition.
Claim 17
Dependent Claim
33 words
Hot-melt adhesive according to claim 1, wherein said electrically conductive substance comprises together two or more of the substances carbon fibres, carbon black or carbon black pigments, graphite, metal particles and antistatic agents.
Claim 18
Dependent Claim
30 words
Hot-melt adhesive according to claim 1, wherein organic amines are provided as modifying agent in a proportion of up to 20% by weight with respect to the dry adhesive composition.
Claim 19
Dependent Claim
32 words
Hot-melt adhesive according to claim 1, wherein organic ethers or polyethers are provided as modifying agent in an amount of up to 40% by weight with respect to the dry adhesive composition.
Claim 20
Dependent Claim
23 words
Hot-melt adhesive according to claim 1, wherein hollow body fillers are provided having a mean particle diameter in the range of 10-90 μm.
Claim 21
Dependent Claim
34 words
Method of forming a hot-melt adhesive application on a material to be stuck in accordance with claim 1 wherein said hot-melt adhesive is prepared as solution or dispersion or emulsion in water and applied.
Claim 22
Dependent Claim
34 words
Method of forming a hot-melt adhesive coating on a material to be stuck according to claim 1, wherein said hot-melt adhesive is prepared as solution or dispersion or emulsion in organic solvents and applied.
Claim 23
Dependent Claim
32 words
Method of forming a hot-melt adhesive coating on a material to be stuck in accordance with claim 1, wherein said hot-melt adhesive is applied in molten form without volatile liquid carrier medium.
Claim 24
Dependent Claim
15 words
Method according to claim 20, wherein said hot-melt adhesive is applied in mechanically foamed form.
Claim 25
Dependent Claim
15 words
Method according to claim 21, wherein said hot-melt adhesive is applied in mechanically foamed form.
Claim 26
Dependent Claim
15 words
Method according to claim 22, wherein said hot-melt adhesive is applied in mechanically foamed form.
Claim 27
Dependent Claim
18 words
Method according to claim 20, wherein said hot-melt adhesive is foamed chemically before, during or after the application.
Claim 28
Dependent Claim
18 words
Method according to claim 21, wherein said hot-melt adhesive is foamed chemically before, during or after the application.
Claim 29
Dependent Claim
18 words
Method according to claim 22, wherein said hot-melt adhesive is foamed chemically before, during or after the application.
Claim 30
Dependent Claim
72 words
Method of forming a self-supporting hot-melt adhesive sheet or foil from a hot-melt adhesive according to claim 1, wherein said hot-melt adhesive is applied in liquid or molten-on form by means of brushing, rolling, splashing, spraying or another application method over part or all of the area to an intermediate carrier and after the drying or hardening or setting is detached from the intermediate carrier as self-supporting hot-melt adhesive foil or sheet.
Claim 31
Dependent Claim
96 words
A hot-melt adhesive sheet comprising at least one component which under the action of microwaves on the dry hot-melt adhesive leads to an increased heating up rate compared with a corresponding dry hot-melt adhesive without said component and thereby to a higher melting-on rate, a binder base of one or more thermoplastic polymers and a microwave-activatable electrically conductive substance having an electrical conductivity greater than that of a dry hot-melt adhesive without said electrically conductive substance, wherein the hot-melt adhesive is formed as a self-supporting sheet after the drying or hardening or setting of the adhesive.
Claim 32
Dependent Claim
96 words
A hot-melt adhesive sheet comprising at least one component which under the action of microwaves on the dry hot-melt adhesive leads to an increased heating up rate compared with a corresponding dry hot-melt adhesive without said component and thereby to a higher melting-on rate, a binder base of one or more thermoplastic polymers and a microwave-activatable electrically conductive substance having an electrical conductivity greater than that of a dry hot-melt adhesive without said electrically conductive substance, wherein the hot-melt adhesive is formed as a self-supporting sheet after the drying or hardening or setting of the adhesive.
Claim 33
Dependent Claim
17 words
Hot-melt adhesive according to claim 30, wherein the hot-melt adhesive is a sheet having holes formed therein.
Claim 34
Dependent Claim
16 words
A hot-melt adhesive sheet according to claim 30, wherein said electrically conductive substance comprises carbon fibres.
Claim 35
Dependent Claim
20 words
A hot-melt adhesive sheet according to claim 30, wherein said electrically conductive substance comprises carbon black or carbon black pigments.
Claim 36
Dependent Claim
15 words
A hot-melt adhesive sheet according to claim 30, wherein said electrically conductive substance is graphite.
Claim 37
Dependent Claim
28 words
A hot-melt adhesive sheet according to claim 30, wherein said electrically conductive substance comprises metal particles in the form of powder, falkes, grains, folia, fibres or the like.
Claim 38
Dependent Claim
16 words
A hot-melt adhesive sheet according to claim 30, wherein said electrically conductive substance comprises antistatic agents.
Claim 39
Dependent Claim
41 words
A hot-melt adhesive sheet according to claim 30, wherein said electrically conductive substance comprises together two or more of the substances selected from the group consisting of carbon fibres, carbon black or carbon black pigments, graphite, metal particles and antistatic agents.
Claim 40
Dependent Claim
33 words
A hot-melt adhesive sheet according to claim 30, wherein organic amines are provided as a modifying agent in a proportion of up to 20% by weight with respect to the dry adhesive composition.
Claim 41
Dependent Claim
35 words
A hot-melt adhesive sheet according to claim 30, wherein organic ethers or polyethers are provided as a modifying agent in an amount of up to 40% by weight with respect to the dry adhesive composition.
Claim 42
Dependent Claim
28 words
A hot-melt adhesive sheet according to claim 30, wherein hollow body fillers are provided having a mean particle, diameter in the range of 10 to 90 μ m.
References Cited (Backward Citations)
GB1216516A
Cited
DE1938653A1
Cited
US3728205A
Cited
US3982051A
Cited
DE2351941A1
Cited
CH567563A5
Cited
US3914489A
Cited
US4012547A
Cited
US4371576A
Cited
DE3307502A1
Cited
DE3545600A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-05 | 1993-09-04 | 1994-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-05 | 1997-09-04 | 1998-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-05 | 2001-09-04 | 2002-03-06 | $7700.00 | Window Closed / Lapsed |