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US 7,815,993 B2Granted
Honeycomb from paper having flame retardant thermoplastic binder
AssigneeE.I. du Pont de Nemours and Company
InventorsGary Lee Hendren, Subhotosh Khan, Mikhail R. Levit
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Abstract
This invention relates to an improved flame retardant honeycomb comprising high modulus fiber and a flame retardant thermoplastic binder having a melt point of from 120° C. to 350° C. and a limiting oxygen index of 26 or greater, methods for making the honeycomb, and articles comprising the honeycomb. In a preferred embodiment the paper in the honeycomb has a flame classification of UL-94 V-0.
Claims15
A honeycomb having cells comprising a flame resistant non-woven paper,
- the cells being expanded paper sheets bonded to each other along a number of node lines of applied adhesive;
- the non-woven paper comprising:
- a) 5 to 50 parts by weight thermoplastic material having a melting point of from 180° to 300° C., and
- b) 50 to 95 parts by weight of a high modulus fiber having a modulus of 600 grams per denier (550 grams per dtex) or greater, based on the total amount of thermoplastic material and high modulus fiber in the paper,
- wherein the thermoplastic has a limiting oxygen index of at least 26;
- and
- wherein the thermoplastic material is required to flow in a manner of a viscous liquid when heated and solidify when cooled and do so reversibly time and time again on subsequent heating and cooling steps.
4 more elements
Dependencies are inferred from the claim text.