Fibrous webs with improved bonder and creping adhesive
AssigneeScott Paper Company
InventorStephen Richard Grossman
Life of this patent
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Abstract
Creping of fibrous webs to enhance their softness and bulk is improved and the resulting creped web is made strong, water dispersible and non-blocking by employing a bonder and creping adhesive composition containing four components which are blended to produce a mixture having a percent solids of from 10% to 40% and an initial modulus for a film of the solids of less than 1.75 .times. 10.sup.8 dynes/cm.sup.2. The composition (mixture) functions as a bonder for the fibers to impart strength and as a creping adhesive for the web so that creping enhances softness and bulkiness. Also disclosed are methods of creping employing such a bonder and creping adhesive composition and sheet materials creped with such compositions.
Claims22
In the process of imparting strength, softness and bulkiness to water dispersible fibrous webs by applying a bonder and adhesive composition to the formed web and creping the web, the improvement which comprises employing as the bonder and adhesive composition a water based composition having a solids content of from about 10% to about 40% and an initial modulus for a film of the solids of less than 1.75 .times. 10.sup.8 dynes/cm.sup.2, said solids content and modulus being obtained by admixing the following components:
- 1. from 8% to 40% of a water emulsion of a softening compound suitable for use as a fiber bonder whose solid film has an initial modulus of less than 2 .times. 10.sup.7 dynes/cm.sup.2 ;
- 2. from 25% to 60% of a water dispersibility imparting emulsion whose solid film has an initial modulus of from 3 .times. 10.sup.7 to 1 .times. 10.sup.8 dynes/cm.sup.2 ;
- 3. from 10% to 37% of a blocking supressant having a glass transition temperature of from about 0.degree. C to about +50.degree. C;
- and
- 4. from 5% to 12% of a water soluble polymer suitable for use as a fiber bonder and having a viscosity of at least 100 centipoise for an 8% by weight water solution of the polymer.
In the process of imparting strength, softness and bulkiness to water dispersible fibrous webs by applying a bonder and adhesive composition to the formed web and creping the web, the improvement which comprises employing as the bonder and adhesive composition a water based composition having a solids content of from about 10% to about 40% and an initial modulus for a film of the solids of less than 1.75 .times. 10.sup.8 dynes/cm.sup.2, said solids content and modulus being obtained by admixing the following components:
- 1. from 8% to 40% of a water emulsion of a softening compound suitable for use as a fiber bonder whose solid film has an initial modulus of less than 2 .times. 10.sup.7 dynes/cm.sup.2 ;
- 2. from 25% to 65% of a water dispersibility imparting emulsion whose solid film has an initial modulus of from 3 .times. 10.sup.7 to 1 .times. 10.sup.8 dynes/cm.sup.2 ;
- 3. from 10% to 37% of a normally solid, non-ionic, water soluble, oxygen containing, organic blocking suppressant;
- and
- 4. from 5% to 12% of a water soluble polymer suitable for use as a fiber bonder and having a viscosity of at least 100 centipoise for an 8% by weight water solution of the polymer.
A water based bonder and creping adhesive comprising a composition having a solids content of from about 10% to about 40% and an initial modulus for a film of the solids of less than 1.75 .times. 10.sup.8 dynes/cm.sup.2, said solids content and modulus being obtained by admixing the following components:
- 1. from 8% to 40% of a water emulsion of a softening compound suitable for use as a fiber bonder whose solid film has an initial modulus of less than 2 .times. 10.sup.7 dynes/cm.sup.2 ;
- (2) from 25% to 60% of a water dispersibility imparting emulsion whose solids film has an initial modulus of from 3 .times. 10.sup.7 to 1 .times. 10.sup.8 dynes/cm.sup.2 ;
- 3. from 10% to 37% of a blocking suppressant having a glass transition temperature of from about 0.degree. C to about +50.degree. C;
- and
- 4. from 5% to 12% of a water soluble polymer suitable for use as a fiber bonder and having a viscosity of at least 100 centipoise for an 8% by weight water solution of the polymer.
A water based bonder and creping adhesive comprising a composition having a solids content of from about 10% to about 40% of an initial modulus for a film of the solids of less than 1.75 .times. 10.sup.8 dynes/cm.sup.2, said solids content and modulus being obtained by admixing the following components:
- 1. from 8% to 15% of a water emulsion of a softening compound suitable for use as a fiber bonder whose solids film has an initial modulus of less than 2 .times. 10.sup.7 dynes/cm.sup.2 ;
- 2. from 25% to 65% of a water dispersibility imparting emulsion whose solids film has an initial modulus of from 3 .times. 10.sup.7 to 1 .times. 10.sup.8 dynes/cm.sup.2 ;
- 3. from 10% to 37% of a normally solid, non-ionic, water soluble, oxygen containing organic blocking suppressant;
- and
- 4. from 5% to 12% of a water soluble polymer suitable for use as a fiber bonder and having a viscosity of at least 100 centipoise for an 8% by weight water solution of the polymer.
Dependencies are inferred from the claim text.