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US 9,173,767 B2Granted
Thin condom
AssigneeLRC Products Limited
InventorsDavid Michael Hill, Christophe Brodin
Life of this patent
Estimating the term…
Abstract
A condom comprises natural rubber and polyurethane. Preferably, the condom has a single wall thickness of less than 55 μm. More preferably the condom has a single wall thickness of less than 55 μm and a burst pressure of 1.0 kPa or above. A process for making the condom comprises mixing polyurethane and natural rubber latex and forming a condom therefrom.
Claims11
A condom consisting of:
- natural rubber latex in an amount of 100 pphr;
- a stabilizer in an amount from 0.40 pphr to 0.80 pphr;
- a vulcanizing agent in an amount from 0.45 pphr to 0.75 pphr;
- a pH adjuster in an amount from 0.05 pphr to 0.10 pphr;
- a vulcanizing activator in an amount from 0.40 pphr to 0.75 pphr;
- an accelerator in an amount from 0.40 pphr to 0.75 pphr;
- an antioxidant in an amount from 0.15 pphr to 0.25 pphr;
- a polyurethane latex in an amount from 5 pphr to 20 pphr;
- and
- ammoniated water in an amount from 25 pphr to 33 pphr;
- wherein the polyurethane latex comprises an aliphatic polyurethane;
- wherein the condom has a single wall thickness of less than 55 um and a burst pressure of 1.0 kPa or above, further wherein the single wall thickness is calculated using the equation:
- Single
-
-
- wall
-
-
- thickness
- =
- Weight
- Density
- ×
- circumference
- ×
- height
- ×
- 10
- ,
- 000
- wherein single wall thickness=thickness of one condom wall (um), density=density of condom film (g/cm2), circumference=circumference of ring sample (cm), and height=height of ring sample (cm).
28 more elements
Dependencies are inferred from the claim text.