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Microporous materials and articles are disclosed. The microporous materials contain a crystallizable propylene-containing polymer, a beta-nucleating agent, and a diluent that is miscible with the polymer at a temperature above the melting temperature of the polymer and that phase separates from the

Microporous materials and articles are disclosed. The microporous materials contain a crystallizable propylene-containing polymer, a beta-nucleating agent, and a diluent that is miscible with the polymer at a temperature above the melting temperature of the polymer and that phase separates from the polymer at a temperature below the polymer crystallization temperature. The invention is also directed to methods of forming the microporous material using thermal induced phase separation and subsequent processing.

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Microporous materials and articles are disclosed. The microporous materials contain a crystallizable propylene-containing polymer, a beta-nucleating agent, and a diluent that is miscible with the polymer at a temperature above the melting temperature of the polymer and that phase separates from the

Microporous materials and articles are disclosed. The microporous materials contain a crystallizable propylene-containing polymer, a beta-nucleating agent, and a diluent that is miscible with the polymer at a temperature above the melting temperature of the polymer and that phase separates from the polymer at a temperature below the polymer crystallization temperature. The invention is also directed to methods of forming the microporous material using thermal induced phase separation and subsequent processing. herapy 1998; 18(1):130-139 http:www.accp.clm/pharmacotherapy/Abs18_1/130.htm. Management of Chronic Obstructive Pulmonary Disease The New England Journal of Medicine Apr. 8, 1993. Evidence Based Health Policy--Lessons from the Global Burden of Disease Study Science--vol. 274--Nov. 1, 1996. Trends in Chronic Bronchitis and Emphysema. Morbility and Mortality Epidemiology & Statistics Unit Mar. 2001. COPD Fact Sheet http://www.lungusa.org/diseases/copd-factsheet.html (Jan. 2001). The Course and Prognosis of Different Forms of Chronic Airways Obstruction In a Sample From the General Population, The New England Journal of Medicine, Nov. 19, 1987. Chronic Obstructive Pulmonary Disease, Current Practice of Medicine 1999. Standards for the Diagnosis and Care of Patients with Chronic Obstructive Pulmonary Disease, Am J Respir Crit Care Med vol. 152. pp S77-S120, 1995. Relationship of Constitutional Factors and Cigarette Smoking to Decrease in 1-Second Forced Expiratory Volume, American Review of Respiratory Disease, vol. 113, 1976. Effects of Smoking Intervention and the Use of an Inhaled Anticholinergic Bronchodilator on the Rate of Decline of FEV1 JAMA, Nov. 16, 1994--vol. 272. No. 19. Smoking Cessation Among Pulmonary Patients as Related to Type of Respiratory Disease and Demographic Variables Canadian Journal of Public Health vol. 71, May/Jun. 1980. Relationship of Response to a Bronchodilator and Decline in Forced Expiratory Volume in One Second in Population Studies Am Rev Respir Dis 1985; 132:1186-1190. Response to Inhaled Bronchodilators in COPD Chest/91/5/May, 1987/Supplement. Sixteenth Edition--The Merch Manual--1992 Chronic Airways Obstructive Disorders. Oral Corticosteroid Therapy for Patients with Stable Chronic Obstrutive Pulmonary Disease, Annals of Internal Medicine, 1991:114:216-223. Intravenous and Oral Cortocosteroids for the Prevention of Relapse after Treatment of Decompensated COPD Chest/98/4/Oct., 1990. 96th International conference of the American Thoracic Society Day 1--May 5, 2000 Update on Chronic Obstructive Pulmonary Disease Sunday, Apr. 15, 2001. Abstract--Survey of the clinical use of pressurized aerosol inhalers CMA Journal/Apr. 7, 1979/vol. 120, pp. 813-816. A Randomized Trial to Improve Self-Management Practices Adults With Asthma, Arch Inern Med--vol. 150, Aug. 1990. Patient error in use of bronchodilator metered aerosols British Medical Journal Jan. 10, 1990. Patient Assessement of Efficacy of Nebulizer Systems on Their Respiratory Health, Suvey Results (2001) Apr. 1995. Executive Summary, Global Strategy for the Diagnosis, Management, an dPrevnetion of Chronic Obstructive Pulomonary Disease, NHLBI/WHO Workshop Report http://www.goldcodp.com/exec_summary/summary_2001/index.html.