Patents
US 12576620 B2: Modification of polypropylene resins with nucleating agents to enhance mechanical and barrier properties of films
- Granted
- 2026-03-17
- Filed
- 2022-05-05 application 17737360
- Type
- Utility · 27 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
This invention relates to packaging applications. It generally relates to polyethylene or ethylene/α-olefin copolymer based co-extruded, multi-layer films or sheets—rigid or flexible—for thermoforming into shaped containers such as packaging containers. Inter alia, the films have improved barrier properties, toughness, and snapability. Particularly, the films of the present invention comprise one or more stacks of polypropylene layers, wherein at least one stack comprises nucleating agents. In one embodiment, the polypropylene layers in the stack are provided such that any two adjacent layers have different microstructures that provide a interface or interphase between the two layers with likely different microstructures and/or crystallinity. The overall polypropylene stack structure assists in disrupting the transport of oxygen, thereby providing a laminate or structure, for example a rigid film or sheet, with enhanced oxygen-barrier properties. The invention also relates a process for preparing shaped articles such as containers from such films, and to such shaped articles—rigid or flexible—both filled and unfilled.
Source: PTBLXML, file of 2026-03-17 (ipgb20260317.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| Superior Plastics Extrusion Co. Inc. 2 patents | US company or organization | Putnam, CT | PTBLXML, file of 2026-03-17 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| Hari Parvatareddy | Appleton, WI | 3 | PTBLXML, file of 2026-03-17 | |
| Jimmy A. Shah | Rockingham, NC | PTBLXML, file of 2026-03-17 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| B32B | Layered products, i.e. products built-up of strata of flat or non-flat, e.g. cellular or honeycomb, form | B32B27/08 | PTBLXML, file of 2026-03-17 |
| B29C | Shaping or joining of plastics; shaping of material in a plastic state, not otherwise provided for; after-treatment of the shaped products, e.g. repairing | B29C48/022 | PTBLXML, file of 2026-03-17 |
| B65D | Containers for storage or transport of articles or materials, e.g. bags, barrels, bottles, boxes, cans, cartons, crates, drums, jars, tanks, hoppers, forwarding containers; accessories, closures, or fittings therefor; packaging elements; packages | B65D65/40 | PTBLXML, file of 2026-03-17 |
| B29K | Indexing scheme associated with subclasses b29b, b29c or b29d, relating to moulding materials or to materials for ; moulds, ; reinforcements, fillers or preformed parts, e.g. inserts | B29K2023/12 | PTBLXML, file of 2026-03-17 |
| B29L | Indexing scheme associated with subclass b29c, relating to particular articles | B29L2007/008 | PTBLXML, file of 2026-03-17 |
Cooperative Patent Classification, as currently assigned (one row per subclass).
Assignments and security interests
No recorded assignments or security interests on file for this patent.
USPTO bulk data: PatentsView granted patents, disambiguated (PVGPATDIS) for patents, assignees, inventors, places and CPC categories; the USPTO Patent Assignment Dataset (ECORSEXC) for assignments and security interests. Patents filed in the last 20 years. No claims or full text. Links to other records are by name (and state): EXACT means the identical full name and state; FUZZY means a looser name match, with the confidence shown.