Temperature-stabilized articles
View Patent ↗Articles and products for preventing or minimizing temperature increase of a person or object (see the figure). The articles include a base material, and at least one temperature-stabilizing material integral with and dispersed throughout the base material. The temperature-stabilizing materials can be phase change materials and have phase change temperatures. Products can contain a plurality of articles and each article can have a phase change temperature the same as or different than those of other articles in the product. Products include footwear, protective apparel and the like.
1. A shoe comprising:
(a) a sole;
(b) an insole disposed on said sole;
(c) an upper attached to said sole, said upper including:
(i) a vamp; and
(ii) a collar attached to said vamp; and
(d) a tongue attached to said upper;
wherein said insole includes a first polymeric material and a first microencapsulated phase change material dispersed in said first polymeric material, at least one of said tongue, said vamp, and said collar includes a second polymeric material that is less dense than said first polymeric material and a second microencapsulated phase change material dispersed in said second polymeric material, and said first microencapsulated phase change material and said second microencapsulated phase change material have different phase change temperatures.
2. The shoe according to claim 1 , wherein one of said first microencapsulated phase change material and said second microencapsulated phase change material has a phase change temperature in the range of 78° F. to 87° F., and another of said first microencapsulated phase change material and said second microencapsulated phase change material has a phase change temperature in the range of 88° F. to 102° F.
3. The shoe according to claim 1 , wherein one of said first microencapsulated phase change material and said second microencapsulated phase change material has a phase change temperature below normal resting skin temperature, and another of said first microencapsulated phase change material and said second microencapsulated phase change material has a phase change temperature above normal resting skin temperature.
4. The shoe according to claim 1 , wherein said first polymeric material is a first foamed polymeric material having a density in the range of 6 lb/ft 3 to 12 lb/ft 3 .
5. The shoe according to claim 4 , wherein said first foamed polymeric material is a polyurethane foam.
6. The shoe according to claim 1 , wherein a loading of said first microencapsulated phase change material in said first polymeric material is from 30% to 50% by weight of said first polymeric material.
7. The shoe according to claim 1 , wherein said first polymeric material has a specific gravity above 0.90, a tensile strength of at least 10 kg/cm 2 , a tear resistance of at least 3 kg/cm, a resiliency of at least 40%, and a hardness of at least 20 Shore A.
8. The shoe according to claim 7 , wherein said hardness is at least 22 Shore A.
9. The shoe according to claim 1 , wherein said first polymeric material is a non-foamed rubber.
10. The shoe according to claim 1 , wherein said second polymeric material is a second foamed polymeric material having a density in the range of 4 lb/ft 3 to 8 lb/ft 3 .
11. The shoe according to claim 10 , wherein said second foamed polymeric material is a polyurethane foam.
12. The shoe according to claim 1 , wherein a loading of said second microencapsulated phase change material in said second polymeric material is from 20% to 40% by weight of said second polymeric material.
13. The shoe according to claim 1 , wherein said first microencapsulated phase change material and said second microencapsulated phase change material absorb from 2,000 Joules to 3,500 Joules of heat during use of said shoe.
14. The shoe according to claim 1 , wherein said first microencapsulated phase change material and said second microencapsulated phase change material absorb heat to prevent a temperature rise of more than 30° F. above ambient temperature during use of said shoe.