Encasement with a protective shock absorbing combination
Protection against impact damage to delicate items stored in a protective encasement such as cell phone cases is significantly improved by protectively lining the interior of a protective encasement with a unique protective combination. This combination includes a protective inlay or insert of a thermoset viscoelastomeric protector in its static form coated with a compatible and non-confining elastomeric polymer coating. Coating the viscoelastomeric protector with the elastomeric coating necessarily requires retention of an undistorted viscoelastomeric protector in its static form during the formative coating procedure. This can be effectively accomplished by injecting coating under low pressure and high solids coating conditions.
1. A protective encasement combination for protecting a stored item against damage caused by an impacting force, said combination comprising:
A. an encasement for storing items therewithin;
B. a thermoset viscoelastomeric inlay in a static form positioned within the encasement so as to provide impact damage protection to a stored item against the impacting force; and
C. an elastomeric coating overcoating the thermoset viscoelastomeric inlay so as to provide an elastomeric coated inlay;
wherein the thermoset viscoelastomeric inlay comprises a cured thermoset reaction product of a reaction media comprising an epoxidized vegetable oil as a predominant reactant by weight, about 20 to about 40 percent by weight of a polyether triol, about 6 to about 12 percent by weight of a polyether diol, about 5 to about 8 percent by weight of a methylene diphenyl isocyanate-based polyether prepolymer, and about 0 to about 10 percent by weight of a bleached vegetable oil; and
wherein the reaction media has been reacted in the presence of a catalytic amount of a thermosetting catalyst.
2. The combination according to claim 1 wherein the elastomeric coated inlay is confined within an inner rim section of the encasement.
3. The combination according to claim 2 wherein the elastomeric coated inlay is seated within a cavity section of the inner rim section.
4. The combination according to claim 3 wherein the thermoset viscoelastomeric inlay measures from about 10 mil to about 60 mil in thickness.
5. The combination according to claim 4 wherein the thermoset viscoelastomeric inlay is chemically bonded to the encasement.
6. The combination according to claim 4 wherein the elastomeric coating comprises a thermoset elastomeric polymer substantially free from surface tack.
7. The combination according to claim 4 wherein the elastomeric coating comprises a thermoplastic elastomer.
8. The combination according to claim 4 wherein the thermoset viscoelastomeric inlay measures from about 25 mil to about 50 mil in thickness.
9. The combination according to claim 1 wherein the elastomeric coating is chemically bonded to the thermoset viscoelastomeric inlay by applying the elastomeric coating to the reaction media while the reaction media is thermosetting.
10. The combination according to claim 1 wherein:
A. the epoxidized vegetable oil is present in an amount of about 45 to about 60 percent by weight;
B. the polyether triol has a molecular weight ranging from about 1000 to about 2000;
C. the polyether diol has a molecular weight ranging from about 1000 to about 2000; and
D. the polyether prepolymer is a hydrocarbyl isocyanate present in an amount of about 5 percent to about 8 percent by weight.
11. The combination according to claim 8 wherein the thermoset viscoelastomeric inlay has a thickness ranging from about 35 mil to about 45 mil.
12. The combination according to claim 10 wherein the thermoset viscoelastomeric inlay is chemically bonded to the encasement.
13. A method for making a protective encasement combination for protecting stored items against an impacting force, said method comprising:
A. selecting an encasement for a stored item;
B. providing a cured thermoset viscoelastomeric protector in a static form having impacting force arresting properties, wherein the thermoset viscoelastomeric protector is prepared by curing a thermosetting reaction media comprising an epoxidized vegetable oil as a predominant reactant by weight of the thermosetting reaction media, about 20 to about 40 percent by weight of a polyether triol, about 6 to about 12 percent by weight of a polyether diol, about 5 to about 8 percent by weight of a methylene diphenyl isocyanate-based polyether prepolymer, and about 0 to about 10 percent by weight of a bleached vegetable oil, wherein said thermosetting reaction media is reacted in the presence of a catalytic amount of a thermosetting catalyst, and wherein the thermoset viscoelastomeric protector is disposed within an internal cavity region of the encasement; and
C. surface coating the thermoset viscoelastomeric protector with an elastomeric polymer coating, wherein said surface coating is conducted under coating conditions which substantially retain the static form of the thermoset viscoelastomeric protector.
14. The method according to claim 13 wherein the providing includes installing the thermoset viscoelastomeric inlay within internal cavity sections of a retaining rimmed section of the encasement.
15. The method according to claim 14 wherein the thermoset viscoelastomeric inlay has a thickness measuring from about 10 mil to about 60 mil.
16. The method according to claim 15 wherein the elastomeric polymer coating comprises a thermoset elastomer.
17. The method according to claim 15 wherein the elastomeric polymer coating comprises a thermoplastic elastomer.
18. The method according to claim 14 wherein the thermoset elastomeric inlay measures from about 25 mil to about 50 mil in thickness.
19. The method according to claim 13 wherein:
A. the epoxidized vegetable oil is present in an amount of about 45 to about 60 percent by weight;
B. the polyether triol has a molecular weight ranging from about 1000 to about 2000;
C. the polyether diol has a molecular weight ranging from about 1000 to about 2000; and
D. the polyether prepolymer is a hydrocarbyl isocyanate present in an amount of about 5 to about 8 percent by weight.
20. The method according to claim 19 wherein the surface coating comprises an equalized pressure injection molding of the elastomeric polymer coating onto surface of the thermoset viscoelastomeric inlay.
21. The method according to claim 20 wherein the injection molding comprises injecting a molten thermoplastic elastomer onto the thermoset viscoelastomeric inlay at a sufficiently low pressure to retain the static form of the thermoset viscoelastomeric inlay.
22. The method according to claim 19 further comprising applying the thermosetting reaction media by injection molding to the encasement and thereafter allowing the reaction media to cure in situ and thereby chemically bonding the thermoset viscoelastomeric inlay to the encasement.
23. The method according to claim 19 wherein the elastomeric polymer coating comprises a thermoset elastomer.