US4395525A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot melt adhesives
Assignee: Hoechst AG
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Filing: 1980-10-06
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Granted: 1983-07-26
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Expires: 2000-10-06
Abstract
Abstract A hot melt adhesive having a good thermal stability under load, based on a copolymer of a predominant proportion of acrylates or methacrylates, a minor proportion of acrylic or methacrylic acid amides and further based on acrylic or methacrylic acid compounds, characterized in that the copolymer comprises (a) 85 to 95% by weight of alkyl acrylates and/or methacrylates with 1 to 12 carbon atoms in the alkyl radical, (b) 3 to 10% by weight of acrylamide and/or methacrylamide, (c) 0.2 to 5% by weight of one or more olefinically unsaturated mono- or dicarboxylic acids with up to 5 carbon atoms, the sum of components (a) to (c) amounting to 100%, at a and a process for preparing a multi-layer article, containing said adhesives.
Inventors
- 👤 Hannes Fischer
- 👤 Rolf Zimmermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:07
CPC Classifications
C; C09; C09J; C09J133/00; C09J133/04; C09J133/06; C09J133/062; C09J133/064; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C09J2301/00; C09J2301/30; C09J2301/304; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
A hot melt adhesive having a good heat stability comprising a copolymer of (a) from 85 to 95% by weight of an alkylester of at least one carboxylic acid selected from the group consisting of acrylic and methacrylic acid each having 1 to 12 carbon atoms in the alkyl radical, (b) from 3 to 10% by weight of at least one acrylic or methacrylic amide or mixture thereof, (c) from 0.2 to 3% by weight of at least one olefinically unsaturated carboxylic acid having at most 2 carboxylic groups and having up to 5 carbon atoms wherein the total of the percentages is always 100 and wherein the copolymer has a melt viscosity of 20 to 80 Pa.s/180° C.
Claim 2
Dependent Claim
119 words
A hot melt adhesive having a good heat stability comprising a copolymer of (a) from 85 to 95% by weight of an alkylester of at least one carboxylic acid selected from the group consisting of acrylic and methacrylic acid each having 1 to 12 carbon atoms in the alkyl radical, (b) from 3 to 10% by weight of at least one acrylic or methacrylic amide or mixture thereof, (c) from 0.2 to 3% by weight of at least one olefinically unsaturated carboxylic acid having at most 2 carboxylic groups and having up to 5 carbon atoms wherein the total of the percentages is always 100 and wherein the copolymer has a melt viscosity of 20 to 80 Pa.s/180° C.
Claim 3
Dependent Claim
37 words
An adhesive as claimed in claim 1 in which component (a) consists of (a1) at least one butylacrylate, (a2) at least one alkylacrylate having from 6 to 12 carbon atoms in the alkyl radical and (a3) methylmethacrylate.
Claim 4
Dependent Claim
32 words
An adhesive as claimed in claim 2, wherein the weight ratio of component (a1):(a2):(a3) is in the range from (15 to 35):(55 to 85):(5 to 15), wherein the total is always 100.
Claim 5
Dependent Claim
26 words
An adhesive as claimed in claim 3, wherein the weight ratio of component (a1):(a2):(a3) is in the range from (20 to 30):(60 to 75):(7 to 12).
Claim 6
Dependent Claim
20 words
An adhesive as claimed in claim 1, wherein the copolymer has a melt viscosity of at most 55 Pa.s/180° C.
Claim 7
Dependent Claim
16 words
An adhesive as claimed in claim 1 in the form of an adhering hot melt adhesive.
Claim 8
Dependent Claim
32 words
An adhesive of claim 1 wherein the olefinically unsaturated carboxylic acid component (c) of the copolymer is a member selected from the group consisting of acrylic acid, methacrylic acid and mixtures thereof.
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) | 1986-07-25 | 1987-01-24 | 1987-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-25 | 1991-01-24 | 1991-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-25 | 1995-01-24 | 1995-07-26 | $7700.00 | Window Closed / Lapsed |