 Starch composite reinforced rubber composition and tire with at least one component thereof |
| What is claimed is: 1. A rubber composition is provided which comprises (A) 100 parts by weight of ... |
|
| Granular powder of modified polytetrafluoroethylene |
| What is claimed is: 1. A modified polytetrafluoroethylene granular powder obtained by granulating a ... |
|
| Process for cross-linking or degrading polymers and shaped articles obtained by this process |
| What is claimed is: 1. A process for cross-linking (co)polymers of ethylene and elastomers, ... |
|
| Block copolymers of monovinylarenes and conjugated dienes and preparation thereof |
| OF THE INVENTION This is a continuation-in-part of application Ser. No. 08/130,039 filed Sep. 30, 1... |
|
| Plastic toughened plastics |
| In certain embodiments of our invention, plastic toughened plastics including an iPP and an mPE ... |
|
| Method for producing aqueous polymer dispersions containing colorants |
| We claim: 1. A process for preparing dye-comprising aqueous polymer dispersions by aqueous emulsion ... |
|
| Low temperature crosslinkable latexes formed by in-situ generation of a crosslinkable functionality |
| What is claimed is: 1. A crosslinkable latex composition comprising a crosslinkable polymer formed ... |
|
| Clear barrier composites containing polyisobutylene/polyolefin alloy components |
| This invention relates to a composite film suitable for use in parenteral drug or blood container ... |
|
| Matte finish biaxially oriented polypropylene film for cold seal release applications |
| The present invention is based upon the discovery of a new packaging film formulation which ... |
|
| Photocurable sheet, moldings thereof, and processes for producing the same |
| What is claimed is: 1. A photocuring sheet wherein a photocuring resin composition (A) comprising ... |
|
|
Hot melt adhesive pellet comprising continuous coating of pelletizing aid
| Details |
Inventors: Cameron, Janelle C.; Fischer, Carolyn A.; Lehman, Nicholas C.; Lindquist, Jeffrey S.; Olson, Christopher E.; Fox, Steve A.;
Assignee: H. B. Fuller Licensing & Financing Inc. (St. Paul, MN)
Primary Examiner: Szekely; Peter
Assistant Examiner:
Attorney, Agent or Firm: Fischer; Carolyn A.
This invention relates to a hot melt adhesive composition in pellet form. The hot melt adhesive composition is pressure sensitive, having a storage modulus, G', at 25.degree. C., of less than about 5.times.10.sup.6 dynes/cm.sup.2. The pellets are coated with a pelletizing aid on the surface at a concentration preferably ranging from about 1 wt-% to about 30 wt-%. The pelletizing aid is a hot melt adhesive component or a material which does not substantially adversely affect the adhesive properties. The pellets are free-flowing and have a substantially tack-free surface. |
|
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to hot melt adhesive pellets and methods of pelletizing hot melt adhesives to produce free-flowing pellets.
By "free-flowing" or "non-blocking" it is meant that the force for removing a rod, as described in the "Blocking Evaluation" test method, is less than about 10 lbs.
(4.
5 kg) for a 4 lb.
(1.
8 kg) sample at 77.
degree.
F.
(25.
degree.
C.
) for 2 weeks.
This sample size corresponds to an equivalent container height of a 10 inch (25.
4 cm) box containing 8-10 inches (20.
3-25.
4 cm) of pellet.
For drums, the sample weight is increased to about 15 lbs.
(6.
8 kg) to correspond to a container height of 20-30 inches (50.
8-76.
2 cm), whereas for gaylords, a 20 lb.
(9 kg) sample is employed which corresponds to a 40-50 inch (101.
6-127.
0 cm) container height.
Preferably, the pellets are also non-blocking at higher temperatures.
Thus, the removal force should be less than 10 lbs.
(4.
5 kg) after 2 weeks of storage at about 100.
degree.
F.
(38.
degree.
C.
), more preferably at about 120.
degree.
F.
(49.
degree.
C.
), even more preferably at about 130.
degree.
F.
(54.
degree.
C.
), most preferably at about 140.
degree.
F.
(60.
degree.
C.
).
The non-blocking characteristics are surmised to be acceptable provided the hot melt pressure sensitive adhesive pellets exhibit a removal force about equal or less than a high vinyl acetate (44%) low MI (800) ethylene-vinyl acetate pellet under the same conditions.
The adhesive composition is preferably pressure sensitive since it has typically been less problematic to pelletize hot melt adhesive compositions which are not pressure sensitive in nature.
Pressure sensitive adhesive compositions have a storage modulus, G', at 25.
degree.
C.
of less than about 5.
times.
10.
sup.
6 dynes/cm.
sup.
2, in accordance with the Dahlquist criteria.
Depending on the composition, the pressure sensitive adhesive composition may have a storage modulus, G', at about 25.
degree.
C.
, of less than 1.
times.
10.
sup.
6 dynes/cm.
sup.
2 ; for "softer" compositions, a G' of less than about 5
|
|
Adhesives and Rubbers 
