FLAME-RETARDANT HOT MELT PRESSURE SENSITIVE ADHESIVE COMPOSITION, AND METHODS AND ARTICLES INCLUDING THE SAME
A flame-retardant hot melt pressure sensitive adhesive composition that includes styrenic block copolymer, tackifying agent, phosphinic acid salt, polyphosphate, optionally an intumescent agent, and optionally plasticizer.
1 . A flame-retardant hot melt pressure sensitive adhesive composition comprising:
styrenic block copolymer;
tackifying agent;
phosphinic acid salt; and
polyphosphate;
the flame-retardant hot melt pressure sensitive adhesive composition passing the Flammability I and Flammability II test methods.
2 . A flame-retardant hot melt pressure sensitive adhesive composition comprising:
styrenic block copolymer;
tackifying agent;
phosphinic acid salt; and
polyphosphate,
the hot melt pressure sensitive adhesive composition exhibiting a viscosity no greater than 20,000 centipoise at 177° C.
3 . The flame-retardant hot melt pressure sensitive adhesive composition of claim 1 , wherein the polyphosphate comprises a polyphosphate having a melting point no greater than 120° C.
4 . The flame-retardant hot melt pressure sensitive adhesive composition of claim 1 , wherein the polyphosphate comprises a first polyphosphate and a second polyphosphate different from the first polyphosphate, the second polyphosphate having a melting point no greater than 120° C.
5 . The flame-retardant hot melt pressure sensitive adhesive composition of claim 1 , wherein the phosphinic acid salt comprises organic phosphinate salt.
6 . The flame-retardant hot melt pressure sensitive adhesive composition of claim 1 , wherein the phosphinic acid salt comprises a diethyl phosphinate salt.
7 . The flame-retardant hot melt pressure sensitive adhesive composition of claim 1 further comprising a intumescent agent, the intumescent agent being different from the polyphosphate.
8 . The flame-retardant hot melt pressure sensitive adhesive composition of claim 7 , wherein the polyphosphate comprises ammonium polyphosphate and the intumescent agent comprises a melamine derived intumescent agent.
9 . The flame-retardant hot melt pressure sensitive adhesive composition of claim 1 further comprising a component selected from the group consisting of metal oxide, carbon black, expandable graphite, and combinations thereof.
10 . The flame-retardant hot melt pressure sensitive adhesive composition of claim 1 , wherein the styrenic block copolymer comprises radial styrenic block copolymer, maleic anhydride modified styrene-ethylene-butylene-styrene block copolymer, or a combination thereof.
11 . The flame-retardant hot melt pressure sensitive adhesive composition of claim 1 , comprising
from 5% by weight to 35% by weight styrenic block copolymer;
from 5% by weight to 40% by weight phosphinic acid salt;
from 3% by weight to 40% by weight polyphosphate; and
from 10% by weight to 65% by weight tackifying agent.
12 . The flame-retardant hot melt pressure sensitive adhesive composition of claim 1 , comprising
from 10% by weight to 30% by weight styrenic block copolymer;
from 5% by weight to 30% by weight phosphinic acid salt;
from 5% by weight to 30% by weight polyphosphate; and
from 10% by weight to 65% by weight tackifying agent,
the composition further comprising from 5% by weight to 30% by weight plasticizer.
13 . The flame-retardant hot melt pressure sensitive adhesive composition of claim 1 , comprising
from 10% by weight to 30% by weight styrenic block copolymer, wherein the styrenic block copolymer comprises a radial block copolymer;
from 5% by weight to 30% by weight phosphinic acid salt;
from 5% by weight to 30% by weight polyphosphate; and
from 10% by weight to 65% by weight tackifying agent,
the composition further comprising
an intumescent agent different from the polyphosphate; and
from 5% by weight to 30% by weight plasticizer.
14 . The flame-retardant hot melt pressure sensitive adhesive composition of claim 1 , comprising
from 10% by weight to 30% by weight styrenic block copolymer, wherein the styrenic block copolymer comprises a radial block copolymer;
from 5% by weight to 30% by weight phosphinic acid salt;
from 5% by weight to 30% by weight polyphosphate; and
from 10% by weight to 65% by weight tackifying agent,
the composition further comprising
from 5% by weight to 30% by weight plasticizer;
an intumescent agent different from the polyphosphate; and
a flame retardant selected from the group consisting of metal oxide, carbon black, and combinations thereof.
15 . The flame-retardant hot melt pressure sensitive adhesive composition of claim 14 , wherein
the polyphosphate comprises a first polyphosphate and a second polyphosphate different from the first polyphosphate, the second polyphosphate having a melting point no greater than 120° C., and
the intumescent agent is different from the first polyphosphate and the second polyphosphate.
16 . The flame-retardant hot melt pressure sensitive adhesive composition of claim 1 , wherein the sum of the weight of the phosphinic acid salt and the weight of the polyphosphate is no greater than 40% by weight based on the weight of the flame-retardant hot melt pressure sensitive adhesive composition.
17 . The flame-retardant hot melt pressure sensitive adhesive composition of claim 1 , wherein the sum of the weight of the phosphinic acid salt and the weight of the polyphosphate is no greater than 30% by weight based on the weight of the flame-retardant hot melt pressure sensitive adhesive composition.
18 . The flame-retardant hot melt pressure sensitive adhesive composition of claim 1 , wherein the composition exhibits a peel force of at least 1.16 N/cm when tested according to the 180 Degree Peel Adhesion test method, a maximum debonding force of at least 2.94 N when tested according to the Loop Tack test method, a shear adhesion failure temperature of at least 50° C. a viscosity no greater than 8000 cP at 177° C., or a combination thereof.
19 . A process for applying a flame-retardant hot melt pressure sensitive adhesive composition on a battery cell, the process comprising:
releasing the flame-retardant hot melt pressure sensitive adhesive composition of claim 1 from an applicator head in the form of a spray; and
forming an adhesive coated surface on a surface of a first battery cell, the forming comprising contacting the surface of a battery cell with the spray of the flame-retardant hot melt pressure sensitive adhesive composition without the applicator head contacting the surface of the battery cell.
20 . A battery cell array comprising:
a first battery cell;
a second battery cell; and
the flame-retardant pressure sensitive hot melt adhesive composition of claim 1 ,
the first battery cell being adhered to the second battery cell through the flame-retardant pressure sensitive hot melt adhesive composition.