EP0253642A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Fast setting corrugating adhesive
Assignee: HB Fuller Co
•
Filing: 1987-07-15
•
Granted: —
•
Expires: 2007-07-15
Abstract
Abstract The presence of both soluble and insoluble polyvinyl alcohol in a corrugating adhesive containing starch, a boric acid compound, and sodium hydroxide results in substantially increased bond strength and water resistance. The soluble and insoluble fractions of the polyvinyl alcohol composition cooperate during heating of a glue line in a corrugated board product to first rapidly form a strong green bond at the gel temperature of the starch, and then to form a still stronger cured glue line. The corrugating adhesives of the invention can be used without fear of useless gel formation or delamination of the corrugated board in high speed production.
Inventors
- 👤 Robert Marshall Hume Iii
- 👤 Paul Leonard Krankkala
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 18:31
CPC Classifications
C; C09; C09J; C09J103/00; C09J103/02; C08; C08L; C08L2666/00; C08L2666/02; C08L2666/54
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
123 words
An aqueous, fast setting corrugating adhesive composition, which provides for the rapid formation of a strong green bond and a strong finally cured bond which comprises, in an aqueous emulsion a major proportion of water, from 5 to 100 parts by weight of starch per each 100 parts by weight of the adhesive, sufficient alkali metal hydroxide to provide an alkaline pH, from 0.1 to 5 parts by weight of a boric acid compound per each 100 parts by weight of water, and from 0.01 to 10 parts by weight of a polyvinyl alcohol composition comprising a soluble fraction and an insoluble fraction, wherein there are from 1 to 100 parts by weight of the insoluble fraction per each part of soluble fraction.
Claim 2
Dependent Claim
123 words
An aqueous, fast setting corrugating adhesive composition, which provides for the rapid formation of a strong green bond and a strong finally cured bond which comprises, in an aqueous emulsion a major proportion of water, from 5 to 100 parts by weight of starch per each 100 parts by weight of the adhesive, sufficient alkali metal hydroxide to provide an alkaline pH, from 0.1 to 5 parts by weight of a boric acid compound per each 100 parts by weight of water, and from 0.01 to 10 parts by weight of a polyvinyl alcohol composition comprising a soluble fraction and an insoluble fraction, wherein there are from 1 to 100 parts by weight of the insoluble fraction per each part of soluble fraction.
Claim 3
Dependent Claim
28 words
The composition of claim 1 wherein there are from 2.5 to 90 parts by weight of the insoluble fraction per each part by weight of the soluble fraction.
Claim 4
Dependent Claim
28 words
The composition of claim 2 wherein there are from 5 to 75 parts by weight of the insoluble fraction per each part by weight of the soluble fraction.
Claim 5
Dependent Claim
34 words
The composition of any preceding claim, wherein the polyvinyl alcohol composition is present at a concentration of from 0.02 to 2 parts by weight per each 100 parts by weight of the adhesive composition.
Claim 6
Dependent Claim
24 words
The composition of any preceding claim, wherein the weight ratio of the polyvinyl alcohol composition to the boric acid composition is less than 9:1.
Claim 7
Dependent Claim
19 words
The composition of any preceding claim, wherein the soluble fraction comprises a low molecular weight partially hydrolyzed polyvinyl alcohol.
Claim 8
Dependent Claim
16 words
The composition of any preceding claim, wherein the insoluble fraction comprises a fully hydrolyzed polyvinyl alcohol.
Claim 9
Dependent Claim
39 words
The composition of claims 6 and 7, wherein the partially hydrolyzed polyvinyl alcohol composition has a degree of hydrolysis of not more than 91% and the hydrolyzed polyvinyl alcohol composition has a degree of hydrolysis of at least 94%,
Claim 10
Dependent Claim
21 words
The composition of any preceding claim, wherein the particle size of the insoluble fraction is less than 80 U.S. Standard mesh.
Claim 11
Dependent Claim
66 words
The composition of any preceding claim, wherein the starch is present in the form of ungelatinized starch particles suspended in a carrier phase of a gelatinized starch in an aqueous emulsion wherein there are from 0.01 to 10 parts by weight of gelatinized starch and from 0.01 to 40 parts by weight of ungelatinized starch per each 100 parts by weight of the aqueous adhesive composition.
Claim 12
Dependent Claim
49 words
The composition of any preceding claim, wherein the alkali metal hydroxide is sodium hydroxide which is present at a concentration of from 0.02 to 0.75 parts by weight per each 100 parts by weight of the aqueous adhesive composition, producing a pH that ranges between about 9 and 13.
Claim 13
Dependent Claim
60 words
The composition of any, preceding claim, wherein the boric acid compound comprises H3B03-XH20 or Na 2 B 4 O 7 -XH 2 O, wherein X is a number from 0 to 10 and is present in the aqueous adhesive composition at a concentration of from 0.1 to 5 parts of boric acid per each 100 parts by weight of water.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.