Stretch composites and methods of making the composite
First Claim
1. A process for making a stretch composite from an extensible substrate, said process comprising the steps of:
- a. providing a first extensible substrate;
b. providing an application device, said device including at least one patterned print roll;
c. printing one or more elastomeric compositions by means of said patterned print roll, said compositions having a melt viscosity of from about 1 to about 150 Pa·
s, measured at 175°
C. and 1 s−
1 strain rate, an elasticity of at least about 50 N/m at 20°
C., and a percent set of less than about 20%, onto said substrate thereby forming one or more intermediate structures;
d. incrementally stretching one or more portions of the intermediate structures to permanently elongate the substrate in the portions; and
e. converting the elastomeric composition into elastomeric members forming one or more elasticized regions of the substrate;
wherein said elastomeric composition comprises a thermoplastic elastomer and a phase change solvent having the general formula;
R′
−
Ly−
(Q−
Lx)n-1−
Q−
Ly−
R;
(I)
R′
−
Ly−
(Q−
Lx)n−
R;
(II)
R′
−
(Q−
Lx)n−
R;
(III)
R′
−
(Q−
Lx)n-1−
Q−
Ly−
R;
(IV)
R′
−
(Q−
Lx)n-1−
Q−
R;
or
(V)a mixture thereof;
wherein Q is a para-ring substituted difunctional aromatic moiety, 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.
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Accused Products
Abstract
A stretch composite having one or more elastomeric members disposed on at least one region of an extensible fibrous substrate to provide stretch properties to a targeted region of the substrate. 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 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 stretch composites.
-
Citations
15 Claims
-
1. A process for making a stretch composite from an extensible substrate, said process comprising the steps of:
-
a. providing a first extensible substrate; b. providing an application device, said device including at least one patterned print roll; c. printing one or more elastomeric compositions by means of said patterned print roll, said compositions having a melt viscosity of from about 1 to about 150 Pa·
s, measured at 175°
C. and 1 s−
1 strain rate, an elasticity of at least about 50 N/m at 20°
C., and a percent set of less than about 20%, onto said substrate thereby forming one or more intermediate structures;d. incrementally stretching one or more portions of the intermediate structures to permanently elongate the substrate in the portions; and e. converting the elastomeric composition into elastomeric members forming one or more elasticized regions of the substrate; wherein said elastomeric composition comprises a thermoplastic elastomer and a phase change solvent having the general formula;
R′
−
Ly−
(Q−
Lx)n-1−
Q−
Ly−
R;
(I)
R′
−
Ly−
(Q−
Lx)n−
R;
(II)
R′
−
(Q−
Lx)n−
R;
(III)
R′
−
(Q−
Lx)n-1−
Q−
Ly−
R;
(IV)
R′
−
(Q−
Lx)n-1−
Q−
R;
or
(V)a mixture thereof; wherein Q is a para-ring substituted difunctional aromatic moiety, 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification