Variable stretch composites and methods of making the composite
Variable stretch composites having one or more first elastomeric members disposed on a first region of an extensible substrate, and one or more second elastomeric members disposed on a second region of the extensible substrate which different from the first elastomeric members to provide variable properties to said regions of the composite. The composite has been incrementally stretched to at least partially break up the structure of the substrate in order to reduce its resistance to stretch. The variable stretch composites are useful for disposable and durable articles, such as disposable absorbent articles including diapers, pull-on diapers, training pants, incontinence briefs, catamenial garments, baby bibs, and the like, and durable articles like garments including sportswear, outerwear and the like. The present invention also relates to methods of forming such variable stretch composites.
1. An absorbent article, the absorbent article comprising an elastic component the elastic component comprising:
(a) a first substrate having an elastomeric composition applied either directly or indirectly via a printing method in a predetermined geometric pattern, selected from the group consisting of rectilinear stripes, curvilinear stripes, triangles, trapezoids, squares, parallelograms, polygons, ellipses, circles and combinations thereof, said pattern comprising at least two individual elastomeric members differing in a property selected from the group consisting of differing width dimensions between the elastomeric members, differing thickness dimensions between the elastomeric members, differing mechanical properties between the elastomeric members, and differing visual appearance between the elastomeric members and such that the elastomeric composition partially penetrates the first substrate, wherein the elastomeric composition comprises a phase change solvent having the general formula:
R′-L y -(Q-L x ) n-1 -Q-L y -R; (I)
R′-L y -(Q-L x ) n -R; (II)
R′-(Q-L x ) n -R; (III)
R′-(Q-L x ) n-1 -Q-L y R; (IV)
R′-(Q-L x ) n-1 -Q-R; or (V)
a mixture thereof;
wherein Q is a para-ring substituted difunctional aromatic moiety, and wherein the substitutions are in the 1,4 positions; L is CH2; R and R′ are the same or different and are independently selected from H, CH3, COOH, CONHR1, CONR1R2, NHR3, NR3R4, hydroxy, or C1-C30 alkoxy; wherein R1, R2, R3 and R4 are the same or different and are independently selected from H or linear or branched alkyl from C1-C30; x is an integer from 1 to 30; y is an integer from 1 to 30; and n is an integer from 3 to 7; wherein the phase change solvent has a phase change in a temperature range from 40° C. to about 250° C.; and
(b) a second substrate joined to the first substrate to form a laminate;
wherein the elastomeric composition is disposed between the first and second substrates.
2. An absorbent article according to claim 1 wherein the elastic component has a percent set less than about 20%.
3. An absorbent article according to claim 1 , wherein the elastic component is selected from the group consisting of a topsheet, a backsheet, an outer cover, an ear, a side panel, a waist member, a leg elastomeric member, a chassis member, a fastener, a fastener with slot and tab and combinations thereof.
4. An absorbent article according to claim 1 wherein the predetermined geometric pattern is selected from the group consisting of continuous patterns and intermittent patterns.
5. An absorbent article according to claim 1 wherein the elastomeric members have a width dimension of at least about 2.0 mm.
6. An absorbent article according to claim 1 wherein the elastomeric members have a thickness dimension of at least about 0.1 mm.
7. An absorbent article according to claim 1 wherein the elastomeric members are spaced apart, adjacent to or at least partially overlap each other.
8. An absorbent article according to claim 1 wherein the elastic component comprises at least one additional elastomeric composition disposed on the substrate.
9. An absorbent article according to claim 8 wherein the elastic component comprises first and second elastomeric compositions and the second composition is disposed on the substrate in a pattern different than the first composition.
10. An absorbent article according to claim 1 wherein the substrate is selected from the group consisting of nonwoven fibrous webs and woven fibrous webs.
11. An absorbent article according to claim 10 wherein the fibers comprise a polyolefin material.
12. An absorbent article according to claim 1 wherein the elastic component has been incrementally stretched.
13. An absorbent article according to claim 1 wherein the second substrate comprises a film.
14. An absorbent article according to claim 1 wherein the printing method is selected from the group consisting of gravure, offset gravure, intaglio, flexographic and ink jet.
15. An absorbent article, the absorbent article comprising an elastic component the elastic component comprising:
a first substrate having an elastomeric composition applied either directly or indirectly via a printing method in a predetermined geometric pattern, selected from the group consisting of rectilinear stripes, curvilinear stripes, triangles, trapezoids, squares, parallelograms, polygons, ellipses, circles and combinations thereof, said pattern comprising at least two individual elastomeric members differing in a property selected from the group consisting of differing width dimensions between the elastomeric members, differing thickness dimensions between the elastomeric members, differing mechanical properties between the elastomeric members, and differing visual appearance between the elastomeric members and such that the elastomeric composition partially penetrates the first substrate, wherein the elastomeric composition comprises a phase change solvent having the general formula:
R′-L y-(Q-L x ) n-1 -Q-L y R; (I)
R′-L y -(Q-L x ) n -R; (II)
R′-(Q-L x ) n -R; (III)
R′-(Q-L x ) n-1 -Q-L y -R; (IV)
R′-(Q-L x ) n-1 -Q-R; or (V)
a mixture thereof;
wherein Q is a para-ring substituted difunctional aromatic moiety, and wherein the substitutions are in the 1,4 positions; L is CH2; R and R′ are the same or different and are independently selected from H, CH3, COOH, CONHR1, CONR1R2, NHR3, NR3R4, hydroxy, or C1-C30 alkoxy; wherein R1, R2, R3 and R4 are the same or different and are independently selected from H or linear or branched alkyl from C1-C30; x is an integer from 1 to 30; y is an integer from 1 to 30; and n is an integer from 3 to 7; wherein the phase change solvent has a phase change in a temperature range from 40° C. to about 250° C.; and wherein the elastomeric member has a melt viscosity of from about 1 to about 150 Pa·s, measured at 175° C. and 1 s−1 and an elasticity of at least about 50 N/m.