Absorbent articles having a breathable stretch laminate

1. An absorbent article comprising:

a chassis, comprising

a topsheet;

a backsheet joined with the topsheet; and

an absorbent core between the topsheet and backsheet; and

an ear extending from the chassis, comprising an incrementally stretched, breathable stretch laminate comprising a laminate of:

first and second nonwoven webs; and

a monolithic elastic member disposed between and joined to the first and second nonwoven webs, wherein said elastic member comprises a phase-separating material having at least a first phase with a first glass transition temperature of less than −40° C. and a second phase with a second glass transition temperature of greater than 100° C., wherein said second phase comprises a polyurethane;

wherein said breathable stretch laminate exhibits a MVTR greater than about 300 grams per square meter per 24 hours and a force relaxation of less than about 50% after about 10 hours at 100° F. and 50% elongation.

2. The article of claim 1 wherein the breathable stretch laminate exhibits a MVTR greater than about 500 grams per square meter per 24 hours.

3. The article of claim 1 wherein the breathable stretch laminate exhibits a MVTR greater than about 1000 grams per square meter per 24 hours.

4. The article of claim 1 wherein the breathable stretch laminate is a zero strain stretch laminate.

5. The article of claim 1 wherein the breathable stretch laminate in 2 cycle 200% hysteresis test exhibits a first cycle 200% load to 50% unload ratio of less than about 16.

6. The article of claim 1 wherein the polyurethane has a molecular weight of at least 40 kDa.

7. The article of claim 1 wherein the phase-separating material is polymerized from (i) a polyether intermediate having at least a tetramethylene oxide repeat unit and, optionally, a repeat unit derived from propylene oxide and/or ethylene oxide; (ii) a diisocyannate; and (iii) a diol or ethoxylated hydroquinone.

8. An absorbent article comprising:

a topsheet;

a backsheet joined with the topsheet;

an absorbent core between the topsheet and backsheet; and

an elastic element comprising an incrementally stretched, breathable zero strain stretch laminate comprising

a nonwoven web; and

a monolithic elastic member joined to the nonwoven web, wherein said elastic member comprises a phase-separating material having at least a first phase with a first glass transition temperature of less than −40° C. and a second phase with a second glass transition temperature of greater than 100° C., and wherein said second phase comprises a polyurethane;

wherein said breathable zero strain stretch laminate exhibits a MVTR greater than about 300 grams per square meter per 24 hours, a force relaxation of less than about 50% after about 10 hours at 100° F. and 50% elongation, and a first cycle 200% load to 50% unload ratio of less than about 16.

9. An absorbent article comprising:

a chassis, comprising

a topsheet;

a backsheet joined with the topsheet; and

an absorbent core between the topsheet and backsheet; and

an ear extending from the chassis, comprising a breathable stretch laminate comprising a laminate of:

a nonwoven web; and

a monolithic elastic member joined to the nonwoven web, the elastic member comprising a hard block comprising a polyurethane and a soft block comprising a polyether selected from the group consisting of polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and combinations thereof;

wherein the breathable stretch laminate exhibits a MVTR greater than about 500 grams per square meter per 24 hours and a force relaxation of less than about 50% after about 10 hours at 100° F. and 50% elongation.

10. The article of claim 9 wherein the breathable stretch laminate exhibits a MVTR greater than about 1000 grams per square meter per 24 hours.

11. The article of claim 9 wherein the breathable stretch laminate in 2 cycle 200% hysteresis test exhibits a first cycle 200% load to 50% unload ratio of less than about 16.