Polymer compositions and products formed therewith
AssigneeChurch & Dwight Co., Inc.
InventorsMuthiah Thiyagarajan, Carmen Guzman, Jon Toliver, John Ip
Life of this patent
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Abstract
The present disclosure provides compositions and products formed therefrom. In particular, the disclosure provides elastomeric latex articles, such as gloves and condoms, that can exhibit a desired combination of properties that can be correlated to suitable strength and softness.
Claims10
An elastomeric article prepared according to a method comprising:
- preparing a compounded latex composition including a synthetic rubber latex polymer, at least one sulfur donor, at least one amphoteric surfactant, and at least one dithiocarbamate accelerator, wherein the synthetic rubber latex polymer is poly(styrene-isoprene-styrene);
- prevulcanizing the compounded latex composition to form a prevulcanized compounded latex composition, said prevulcanizing being carried out for a first time period at a first temperature and then for a second time period at a second, lower temperature, the prevulcanizing being effective to achieve a relaxed modulus of about 0.50 to about 0.61;
- dipping a former into the prevulcanized compounded latex composition to form at least one layer of the prevulcanized compounded latex composition thereon;
- and
- curing the at least one layer of the prevulcanized compounded latex composition on the former to provide the elastomeric article;
- wherein the elastomeric article is a condom;
- and
- wherein the elastomeric article at a thickness of about 0.1 mm or less exhibits a tensile strength of greater than 28 MPa when measured in accordance with ASTM D412, exhibits a tear strength of greater than 2 N/mm where measured in accordance with ASTM D412 or ASTM D624, exhibits a tensile modulus at 500% elongation of about 1.1 MPa to about 2.5 MPa when measured in accordance with ASTM D412, exhibits an elongation at break of about 1,100% or greater, and exhibits a Young's modulus (E′) that is less than 1 MPa at a frequency of 1 Hz and that is greater than 1 MPa at a frequency of 21.5 Hz.
An elastomeric article comprising one or more layers of a polymer composition formed from a synthetic rubber latex selected from the group consisting of styrene ethylene butylene styrene, water-based polyurethane, nitrile rubber, and combinations thereof, wherein the elastomeric article at a thickness of about 0.1 mm or less exhibits a tensile strength of greater than 30 MPa when measured in accordance with ASTM D412, exhibits a tear strength of greater than 2 N/mm where measured in accordance with ASTM D412 or ASTM D624, exhibits a tensile modulus at 500% elongation of about 1.1 MPa to about 2.5 MPa when measured in accordance with ASTM D412, and exhibits an elongation at break of about 1,100% or greater.
Dependencies are inferred from the claim text.