Method of making a polymer article and resulting article
AssigneeNobel Scientific Sdn. Bhd
InventorsDiing Yaw Chieng, Hung Than Mar
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Abstract
A method of making a polymer article comprises the steps of making a polymer solution by mixing a first compound containing carbodiimide groups with a second compound containing carboxylated groups, applying the polymer solution to a former, wherein the step of applying occurs within 2 hours of the making of the polymer solution, and curing the polymer solution. The polymer solution can have a pH adjuster consisting of ammonium hydroxide.
Claims24
A method of making a standalone polymer article comprising, in combination, the steps of:
- making a self-crosslinking polymer solution by mixing, at 30° C. to 40° C. for only 0.5 hour to 2 hours, a first compound containing oligocarbodiimide groups or polycarbodiimide groups, a second compound containing carboxylated groups, initially a pH adjuster consisting of ammonium hydroxide, and an antioxidant comprising a butylated reaction product of p-cresol and cyclopentadiene, the polymer solution free of any additional crosslinking agents and any accelerators;
- applying the self-crosslinking polymer solution to a former, wherein the step of applying occurs within 2 hours of the making of the self-crosslinking polymer solution;
- drying the self-crosslinking polymer solution to form a wet gel;
- treating the wet gel of the self-crosslinking polymer solution with a mild organic acid and pre-leaching the wet gel coated former in water to remove the pH adjuster;
- curing the self-crosslinking polymer solution for 8 minutes to 20 minutes in an oven at a temperature within a range of from 80° C. to 130° C. to form a cured carboxylated nitrile latex, the cured carboxylated nitrile latex free of any additional crosslinking agents and any accelerators;
- and
- leaching the cured carboxylated nitrile latex for 50 seconds to no more than 120 seconds in water at 50° C. to 60° C. to form the standalone polymer article, wherein a film breakthrough leak time in cyclohexanone is more than 330 minutes.
A standalone polymer article formed from a cured carboxylated nitrile latex, comprising, in combination:
- a reaction product of a first compound containing oligocarbodiimide groups or polycarbodiimide groups and a second compound containing carboxylated groups;
- and
- an antioxidant comprising a butylated reaction product of p-cresol and cyclopentadiene, the cured carboxylated nitrile latex free of any additional crosslinking agents and any accelerators,
- wherein the standalone polymer article is formed from a self-crosslinking polymer solution matured at 30° C. to 40° C. for only 0.5 hour to 2 hours and comprising the first compound, the second compound, the antioxidant, and initially, a pH adjuster consisting of ammonium hydroxide,
- wherein the self-crosslinking polymer solution is dried to form a wet gel,
- and wherein the wet gel of the self-crosslinking polymer solution is treated with a mild organic acid and subjected to a pre-leaching process to remove the pH adjuster, subjected to a curing process for 8 minutes to 20 minutes in an oven at a temperature of from 80° C. to 130° C. to form the cured carboxylated nitrile latex, and subjected to an additional leaching process for 50 seconds to no more than 120 seconds in water at 50° C. to 60° C. to form the standalone polymer article, wherein a film breakthrough leak time in cyclohexanone is more than 330 minutes.
Dependencies are inferred from the claim text.