Polyolefin-based composition for rotational molding
First Claim
1. A foamable, rotomolding composition comprising a first thermoplastic polymer of ethylene, an effective amount of a suitable foaming agent, which comprises a carbon dioxide-releasing inorganic salt, and an effective amount of a suitable nucleating agent/foaming coagent selected from a mixture of stearic acid and zinc stearate, and a mixture of calcium stearate and stearamide, as particulate matter of a first size;
- and a second thermoplastic polymer of ethylene as particulate matter of a size significantly smaller than said first size for providing an outer skin to a rotomolded article;
wherein said first thermoplastic polymer and said second thermoplastic polymer may be the same or different.
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Abstract
A composition useful for rotational molding and method of rotomolding are provided. The composition advantageously includes particulate matter of significantly different sizes. A first polymer is provided as particulate matter of one size, and a second polymer is provided as particulate matter of a smaller size. During rotomolding, the first polymer forms an inner layer and the second polymer forms an outer layer. Beneficially, foaming may be provided during rotomolding to foam the inner layer.
47 Citations
10 Claims
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1. A foamable, rotomolding composition comprising a first thermoplastic polymer of ethylene, an effective amount of a suitable foaming agent, which comprises a carbon dioxide-releasing inorganic salt, and an effective amount of a suitable nucleating agent/foaming coagent selected from a mixture of stearic acid and zinc stearate, and a mixture of calcium stearate and stearamide, as particulate matter of a first size;
- and a second thermoplastic polymer of ethylene as particulate matter of a size significantly smaller than said first size for providing an outer skin to a rotomolded article;
wherein said first thermoplastic polymer and said second thermoplastic polymer may be the same or different. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- and a second thermoplastic polymer of ethylene as particulate matter of a size significantly smaller than said first size for providing an outer skin to a rotomolded article;
Specification